Perhaps you should try some spelling variations:
de literatur » de literatura, de literatuur, de litterature
filosofia de » filosofia del
studium 3 » studium _, studium 1, studium im
studium 8 » studium _, studium 1, studium im
test das » test des, test day, west das

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "test das ((studium 3) OR (studium 8)) filosofia de literatur".
• Adding a wildcard symbol may retrieve word variants: test das ((studium 3) OR (studium 8)) filosofia de literatur*.