Perhaps you should try some spelling variations:
selbst studium » selbststudium 1, im selbststudium
le litterature » la litterature, de litterature, le letterature
test studium » test studies, das studium, dem 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.

• If you are trying to use Boolean operators, they must be ALL CAPS: test ((((test studium) OR (selbst studium))) OR (des studium)) di filosofia le litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((((test studium) OR (selbst studium))) or (des studium)) di filosofia le litterature".
• Adding a wildcard symbol may retrieve word variants: test ((((test studium) OR (selbst studium))) or (des studium)) di filosofia le litterature*.