Perhaps you should try some spelling variations:
le litterature » la litterature, de litterature, le letterature
test studium » test studies, selbst studium, das studium
di filosofia » la filosofia, e filosofia
filosofia le » filosofia de, filosofia e, filosofia del
des studium » des studiums, das studium, dem studium

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) OR (des studium)) di filosofia le litterature".
• Adding a wildcard symbol may retrieve word variants: test ((test studium) OR (des studium)) di filosofia le litterature*.