Perhaps you should try some spelling variations:
das filosofia » da filosofia, la filosofia, di filosofia
de literatura » de litterature, la literatura, y literatura
e literatura » y literatura, e literatur, a literatura
studium das » studium des, studium der, studium die
tests das » tests des, test das, tests data

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: "tests das studium das filosofia ((e literatura) OR (de literatura))".
• Adding a wildcard symbol may retrieve word variants: tests das studium das filosofia ((e literatura) OR (de literatura))*.