Perhaps you should try some spelling variations:
duale studium » duales studium, dualen studium, das studium
di filosofia » la filosofia, e filosofia
de filosofia » e filosofia, la filosofia, a filosofia
y literatura » la literatura
testo » test, tests, texto

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: testo duale studium ((di filosofia) OR (de filosofia)) y literatura.
• Adding a wildcard symbol may retrieve word variants: testo duale studium ((di filosofia) or (de filosofia)) y literatura*.