Perhaps you should try some spelling variations:
et litterature » la litterature, art literature
di filosofia » la filosofia, e filosofia
da filosofia » la filosofia, a filosofia, de filosofia
des studium » des studiums, das studium, dein studium
dem studium » das studium, im studium, zum studium

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) OR (dem studium)) ((da filosofia) OR (di filosofia)) et litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((des studium) OR (dem studium)) ((da filosofia) or (di filosofia)) et litterature".
• Adding a wildcard symbol may retrieve word variants: test ((des studium) OR (dem studium)) ((da filosofia) or (di filosofia)) et litterature*.