Perhaps you should try some spelling variations:
filosofia la » filosofia da, filosofia le, filosofica da
studium das » studium des, studium der, studium als
studium die » studium der, studium des
filosofia a » filosofia da, filosofia e, filosofia _
tests die » test die, tests 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: tests die ((studium das) OR (studium die)) ((filosofia a) OR (filosofia la)) literature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests die ((studium das) or (studium die)) ((filosofia a) OR (filosofia la)) literature".
• Adding a wildcard symbol may retrieve word variants: tests die ((studium das) or (studium die)) ((filosofia a) OR (filosofia la)) literature*.