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

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