Perhaps you should try some spelling variations:
den studenten » der studenten, von studenten, fur studenten
de literatura » de litterature, la literatura, a literatura
studenten la » studenten a, studenten als, studenten das
y literatura » la literatura
test den » test der, test des, test de

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 den studenten la filosofia ((de literatura) OR (y literatura))*.