Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
dd filosofia » di filosofia, de filosofia, la filosofia
da filosofia » la filosofia, di filosofia, a filosofia
test das » test des, test day, west das

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