Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
y filosofia » a filosofia, la filosofia, di filosofia
e filosofia » la filosofia
du studie » zu studie, eu studies, zu studien
test du » test de, test d, test do

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 du studie ((y filosofia) OR (e filosofia)) de literatura*".