Perhaps you should try some spelling variations:
le literatura » la literatura, de literatura, e literatura
studenten di » studenten die, studenten vi, studenten der
filosofia le » filosofia de, filosofia e, filosofia del
studenten i » studenten im, studenten iv, studenten vi
test des » test der, test test

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 des ((studenten di) OR (studenten i)) filosofia le literatura*".