Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
ds filosofica » di filosofia, de filosofia, da filosofia
de literatura » de litterature, la literatura, y literatura
test duale » test double, test delle, test orale

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 duale studium ((ds filosofica) OR (la filosofia)) de literatura.
• Adding a wildcard symbol may retrieve word variants: test duale studium ((ds filosofica) or (la filosofia)) de literatura*.