Perhaps you should try some spelling variations:
filosofia da » filosofia de, filosofia del, filosofia e
des studium » des studiums, das studium, dem studium
studium das » studium des, studium der, studium die
filosofia a » filosofia la, filosofia e, filosofia _
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 a) OR (filosofia da)) litterature".
• Adding a wildcard symbol may retrieve word variants: test des studium das ((filosofia a) OR (filosofia da)) litterature*.