Perhaps you should try some spelling variations:
la litterature » a literature
duale studien » scale studien, duales studium, dualen studium
duale studium » duales studium, dualen studium, das studium
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 studien) OR (duale studium)) la filosofia la litterature*".