Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
test studium » des studium, test studies, selbst studium
di filosofia » la filosofia
e filosofia » la filosofia
test test » testing 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 test studium ((di filosofia) OR (e filosofia)) del litterature".
• Adding a wildcard symbol may retrieve word variants: test test studium ((di filosofia) OR (e filosofia)) del litterature*.