Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
di filosofia » la filosofia, e filosofia
des studium » des studiums, das studium, dem studium
a filosofia » la filosofia, e filosofia
test des » test der, test test

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 des studium ((a filosofia) OR (di filosofia)) et litterature.
• Adding a wildcard symbol may retrieve word variants: test des studium ((a filosofia) or (di filosofia)) et litterature*.