Perhaps you should try some spelling variations:
e literatura » de literatura, y literatura, e literatur
e filosofia » la filosofia
filosofia e » filosofia de, filosofia del
studien e » studien es, studien _, studien 3
test den » test der, test de, testen den
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 den) OR (test des)) studien e filosofia e literatura*".