Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
duale studium » duales studium, dualen studium, das studium
e filosofica » e filosofia, e filosofiche, a filosofia
di filosofia » la filosofia, e filosofia
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 ((e filosofica) OR (di filosofia)) de literatura.
• Adding a wildcard symbol may retrieve word variants: test duale studium ((e filosofica) or (di filosofia)) de literatura*.