Perhaps you should try some spelling variations:
le letterature » e letterature, la litterature, e letteratura
della studium » della studiosa, dem studium, dello studio
das filosofia » da filosofia, la filosofia, di filosofia
filosofia le » filosofia de, filosofia e, filosofia del

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: testi ((della studium) OR (das studium)) das filosofia le letterature.
• Adding a wildcard symbol may retrieve word variants: testi ((della studium) or (das studium)) das filosofia le letterature*.