Perhaps you should try some spelling variations:
nella letteratura » e letteratura
della letteratura » e letteratura
5 filosofia » e filosofia, a filosofia, y filosofia
studium 5 » studium _, studium 1, studium 3

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: (quito OR quite) das studium 5 filosofia ((della letteratura) OR (nella letteratura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(quito or quite) das studium 5 filosofia ((della letteratura) OR (nella letteratura))".
• Adding a wildcard symbol may retrieve word variants: (quito or quite) das studium 5 filosofia ((della letteratura) OR (nella letteratura))*.