Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
da filosofia » la filosofia, a filosofia, de filosofia
di filosofia » la filosofia, e filosofia
zum studium » im studium

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test ((zum studium) OR (fur studium)) ((da filosofia) OR (di filosofia)) de literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((zum studium) or (fur studium)) ((da filosofia) OR (di filosofia)) de literatura".
• Adding a wildcard symbol may retrieve word variants: test ((zum studium) or (fur studium)) ((da filosofia) OR (di filosofia)) de literatura*.