Perhaps you should try some spelling variations:
le letterature » e letterature, la litterature, e letteratura
da filosofia » la filosofia, di filosofia, de filosofia
des studium » des studiums, das studium, dem studium
a filosofia » la filosofia, e filosofia, di filosofia
test des » test der, test test

You may be able to get more results by adjusting your search query.

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