Perhaps you should try some spelling variations:
a litterature » la litterature, a literature, _ litterature
di filosofia » la filosofia, e filosofia
des studium » des studiums, das studium, dem studium
a filosofia » la filosofia, e 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 ((a filosofia) OR (di filosofia)) a litterature".
• Adding a wildcard symbol may retrieve word variants: test des studium ((a filosofia) OR (di filosofia)) a litterature*.