Perhaps you should try some spelling variations:
des studenten » der studenten, den studenten, die studenten
studenten vi » studenten i, studenten v, studenten die
filosofia le » filosofia de, filosofia del, filosofia da
filosofia e » filosofia de, filosofia del
test des » test der, test test

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 des studenten vi ((filosofia le) OR (filosofia e)) literatura*".