diff --git a/backend/apps/data_training/curd/data_training.py b/backend/apps/data_training/curd/data_training.py
index 5507adef..8b77c3b5 100644
--- a/backend/apps/data_training/curd/data_training.py
+++ b/backend/apps/data_training/curd/data_training.py
@@ -55,7 +55,7 @@ def build_data_training_query(session: SessionDep, oid: int, name: Optional[str]
 
     if ds_filter_condition is not None and adv_filter_condition is not None:
         parent_ids_subquery = parent_ids_subquery.where(
-            or_(ds_filter_condition, adv_filter_condition)
+            and_(ds_filter_condition, adv_filter_condition)
         )
     elif ds_filter_condition is not None:
         parent_ids_subquery = parent_ids_subquery.where(ds_filter_condition)
diff --git a/backend/apps/terminology/curd/terminology.py b/backend/apps/terminology/curd/terminology.py
index ee53c5c0..91012039 100644
--- a/backend/apps/terminology/curd/terminology.py
+++ b/backend/apps/terminology/curd/terminology.py
@@ -86,7 +86,7 @@ def build_terminology_query(session: SessionDep, oid: int, name: Optional[str] =
 
     if ds_filter_condition is not None and adv_filter_condition is not None:
         parent_ids_subquery = parent_ids_subquery.where(
-            or_(ds_filter_condition, adv_filter_condition)
+            and_(ds_filter_condition, adv_filter_condition)
         )
     elif ds_filter_condition is not None:
         parent_ids_subquery = parent_ids_subquery.where(ds_filter_condition)