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