Perhaps you should try some spelling variations:
filosofia con » filosofia del, filosofia de, filosofia e
filosofia en » filosofia e, filosofia del, filosofia de
des studium » des studiums, das studium, dem studium
studium das » studium des, studium der, studium die
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 studium das ((filosofia en) OR (filosofia con)) litterature*".