Perhaps you should try some spelling variations:
des studenten » der studenten, den studenten, die studenten
studenten die » studenten der, studenten des, studenten und
die filosofia » di filosofia, de filosofia, e filosofia
de literatura » de litterature, la literatura, a literatura
y literatura » la literatura
test des » test der, test test

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 des studenten die filosofia ((de literatura) OR (y literatura))*.