Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
data studium » das studium, data studies, data studio
y filosofia » e filosofia, a filosofia, di filosofia
tests data » test data, lists data, testing data

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: "tests data studium ((y filosofia) OR (la filosofia)) del literatura*".