Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
studenten 5 » studenten _, studenten und, studenten der
5 filosofia » e filosofia, a filosofia, y filosofia
filosofia e » filosofia de, filosofia del
test den » test des, test de, testen den

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 den) OR (test der)) studenten 5 filosofia e literatura*".