diff --git a/app/filter.py b/app/filter.py
index baa890f..cdf627b 100644
--- a/app/filter.py
+++ b/app/filter.py
@@ -3,15 +3,23 @@ from ics import Calendar
 td_titles = ["TD"]
 sh_titles = ["ANGLAIS", "Anglais", "ETHIQUE"]
 
-def _filter_group(name: str, titles: list[str], group: str) -> bool:
+def _filter_group(name: str, titles: list[str], group: str) -> bool | None:
     for title in titles:
         if title in name:
             return "Examen" in name or group == "all" or group in name
 
-    return True
+    return None
 
 def _filter_event(name: str, td_group: str, sh_group: str) -> bool:
-    return _filter_group(name, td_titles, td_group) and _filter_group(name, sh_titles, sh_group)
+    res = _filter_group(name, sh_titles, sh_group)
+    if res:
+        return True
+
+    elif res == None:
+        if _filter_group(name, td_titles, td_group) != False:
+            return True
+
+    return False
 
 def filter_calendar(calendar: Calendar, td_group: str, sh_group: str) -> Calendar:
     filtered_calendar = Calendar()