Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
duale studium » duales studium, dualen studium
dd filosofia » di filosofia, de filosofia, da filosofia
filosofia la » filosofia da, filosofia le, filosofica da

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