Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
studium das » studium des, studium der, studium die
filosofia a » filosofia da, filosofia la, filosofia _
filosofia e » filosofia de, filosofia del
test duale » test double, test delle, test orale

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 das ((filosofia a) OR (filosofia e)) literatura*".