Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
ds filosofica » de filosofia, da filosofia, e filosofica
de literatura » de litterature, la literatura, a literatura
di filosofia » la filosofia, e filosofia
y literatura » la 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 (di filosofia)) ((de literatura) OR (y literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test duale studium ((ds filosofica) or (di filosofia)) ((de literatura) OR (y literatura))".
• Adding a wildcard symbol may retrieve word variants: test duale studium ((ds filosofica) or (di filosofia)) ((de literatura) OR (y literatura))*.