Perhaps you should try some spelling variations:
la literature » la litterature, a literature, la literatura
filosofia la » filosofia da, filosofia le, filosofica da
studien am » studien aus, studien auf, studien _
test oral » test oracle, test orn, test oracles
studien a » studien _, studien 3, studien 4

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 oral ((studien a) OR (studien am)) filosofia la literature*".