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