diff --git a/main/inc/ajax/model.ajax.php b/main/inc/ajax/model.ajax.php
index 3dfee3e6e5..8912a22524 100755
--- a/main/inc/ajax/model.ajax.php
+++ b/main/inc/ajax/model.ajax.php
@@ -213,8 +213,21 @@ switch ($action) {
         if ($searchByGroups) {
             $groups = GroupPortalManager::get_groups_by_user(api_get_user_id(), GROUP_USER_PERMISSION_ADMIN);
             $groupsId = array_keys($groups);
+            $subgroupsId = [];
 
             if (is_array($groupsId)) {
+                foreach ($groupsId as $groupId) {
+                    $subgroupsId = array_merge(
+                        $subgroupsId,
+                        GroupPortalManager::getGroupsByDepthLevel($groupId)
+                    );
+                }
+
+                $groupsId = array_merge(
+                    $groupsId,
+                    $subgroupsId
+                );
+
                 foreach ($groupsId as $groupId) {
                     $groupUsers = GroupPortalManager::get_users_by_group($groupId);
 
@@ -263,6 +276,11 @@ switch ($action) {
             $sessionIdList = array_unique($sessionIdList);
         }
 
+        if (api_is_student_boss() && empty($userIdList)) {
+            $count = 0;
+            break;
+        }
+
         if ($action == 'get_user_course_report') {
             $count = CourseManager::get_count_user_list_from_course_code(
                 false,
@@ -567,6 +585,11 @@ switch ($action) {
             //$sidx = 'training_hours';
         }
 
+        if (api_is_student_boss() && empty($userIdList)) {
+            $result = [];
+            break;
+        }
+
         $result = CourseManager::get_user_list_from_course_code(
             null,
             null,
@@ -621,6 +644,11 @@ switch ($action) {
             $sidx = 'title';
         }
 
+        if (api_is_student_boss() && empty($userIdList)) {
+            $result = [];
+            break;
+        }
+
         $result = CourseManager::get_user_list_from_course_code(
             null,
             null,
diff --git a/main/inc/lib/group_portal_manager.lib.php b/main/inc/lib/group_portal_manager.lib.php
index 6d3e02dff2..73da630502 100755
--- a/main/inc/lib/group_portal_manager.lib.php
+++ b/main/inc/lib/group_portal_manager.lib.php
@@ -217,6 +217,55 @@ class GroupPortalManager
         }
     }
 
+    /**
+     * Get the subgroups ID from a group.
+     * The default $levels value is 10 considering it as a extensive level of depth
+     * @param int $groupId The parent group ID
+     * @param int $levels The depth levels
+     * @return array The list of ID
+     */
+    public static function getGroupsByDepthLevel($groupId, $levels = 10)
+    {
+        $groups = array();
+        $groupId = intval($groupId);
+
+        $groupTable = Database::get_main_table(TABLE_MAIN_GROUP);
+        $groupRelGroupTable = Database :: get_main_table(TABLE_MAIN_GROUP_REL_GROUP);
+
+        $select = "SELECT ";
+        $from = "FROM $groupTable g1 ";
+
+        for ($i = 1; $i <= $levels; $i++) {
+            $tableIndexNumber = $i;
+            $tableIndexJoinNumber = $i - 1;
+
+            $select .= "g$i.id as id_$i ";
+
+            $select .= ($i != $levels ? ", " : null);
+
+            if ($i == 1) {
+                $from .= "INNER JOIN $groupRelGroupTable gg0 ON g1.id = gg0.subgroup_id and gg0.group_id = $groupId ";
+            } else {
+                $from .= "LEFT JOIN $groupRelGroupTable gg$tableIndexJoinNumber ";
+                $from .= " ON g$tableIndexJoinNumber.id = gg$tableIndexJoinNumber.group_id ";
+                $from .= "LEFT JOIN $groupTable g$tableIndexNumber ";
+                $from .= " ON gg$tableIndexJoinNumber.subgroup_id = g$tableIndexNumber.id ";
+            }
+        }
+
+        $result = Database::query("$select $from");
+
+        while ($item = Database::fetch_assoc($result)) {
+            foreach ($item as $groupId) {
+                if (!empty($groupId)) {
+                    $groups[] = $groupId;
+                }
+            }
+        }
+
+        return array_map('intval', $groups);
+    }
+
     /**
      * @param int $root
      * @param int $level
@@ -234,7 +283,7 @@ class GroupPortalManager
             if ($i == $level) {
                 $select_part .= "g$i.id as id_$i, g$i.name as name_$i ";
             } else {
-                $select_part .="g$i.id as id_$i, g$i.name name_$i, ";
+                $select_part .= "g$i.id as id_$i, g$i.name name_$i, ";
             }
             if ($i == 1) {
                 $cond_part .= "FROM $t_group g1 JOIN $t_rel_group rg0 on g1.id = rg0.subgroup_id and rg0.group_id = $root ";
@@ -245,24 +294,24 @@ class GroupPortalManager
         }
         $sql = $select_part.' '.$cond_part;
         $res = Database::query($sql);
-        $toreturn = array();
+        $toReturn = array();
 
         while ($item = Database::fetch_assoc($res)) {
             foreach ($item as $key => $value) {
                 if ($key == 'id_1') {
-                    $toreturn[$value]['name'] = $item['name_1'];
+                    $toReturn[$value]['name'] = $item['name_1'];
                 } else {
                     $temp = explode('_', $key);
-                    $index_key = $temp[1];
-                    $string_key = $temp[0];
-                    $previous_key = $string_key.'_'.$index_key - 1;
-                    if ($string_key == 'id' && isset($item[$key])) {
-                        $toreturn[$item[$previous_key]]['hrms'][$index_key]['name'] = $item['name_'.$index_id];
+                    $indexKey = $temp[1];
+                    $stringKey = $temp[0];
+                    $previousKey = $stringKey.'_'.$indexKey - 1;
+                    if ($stringKey == 'id' && isset($item[$key])) {
+                        $toReturn[$item[$previousKey]]['hrms'][$indexKey]['name'] = $item['name_'.$indexKey];
                     }
                 }
             }
         }
-        return $toreturn;
+        return $toReturn;
     }
 
     /**
@@ -292,16 +341,16 @@ class GroupPortalManager
         $sql = $select_part.' '.$cond_part."WHERE rg0.subgroup_id='$group_id'";
         $res = Database::query($sql);
         $temp_arr = Database::fetch_array($res, 'NUM');
-        $toreturn = array();
+        $toReturn = array();
         if (is_array($temp_arr)) {
             foreach ($temp_arr as $elt) {
                 if (isset($elt)) {
-                    $toreturn[] = $elt;
+                    $toReturn[] = $elt;
                 }
             }
         }
 
-        return $toreturn;
+        return $toReturn;
     }
 
     /**