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