Perhaps you should try some spelling variations:
den studenten » der studenten, von studenten, fur studenten
de literatura » de litterature, la literatura, a literatura
studenten di » studenten die, studenten i, studenten vi
di filosofia » la filosofia, e filosofia
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "test den studenten di filosofia ((de literatura) OR (y literatura))*".