Perhaps you should try some spelling variations:
de studenten » der studenten, den studenten, die studenten
studenten de » studenten der, studenten des, studenten die
de filosofia » e filosofia, di filosofia, la filosofia
a literatura » la literatura, y literatura, a literatur
test de » test der, test des, est 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 de studenten de filosofia ((a literatura) OR (a literature))*".