Perhaps you should try some spelling variations:
de literatur » de literatura, de literatuur, de litterature
y filosofia » e filosofia, la filosofia, di filosofia
a filosofia » la filosofia, e filosofia, di filosofia
test das » test des, test day, west das

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: test das studium ((y filosofia) OR (a filosofia)) de literatur.
• Adding a wildcard symbol may retrieve word variants: test das studium ((y filosofia) or (a filosofia)) de literatur*.