Perhaps you should try some spelling variations:
la litterature » a literature
filosofia la » filosofia da, filosofia le, filosofica da
studium la » studium a, studium als, studium das
studium ad » studium am, studium a, studium d
test d » test de, test do, test der

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test d ((studium la) OR (studium ad)) filosofia la litterature.
• Adding a wildcard symbol may retrieve word variants: test d ((studium la) or (studium ad)) filosofia la litterature*.