Perhaps you should try some spelling variations:
filosofia de » filosofia del
de literatur » de literatura, de literatuur, de litterature
dem studium » zum studium
e filosofia » la filosofia

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: rest ((((dem studium) OR (im studium))) OR (das studium)) e filosofia de literatur.
• The words AND, OR and NOT may confuse the search; try adding quotes: "rest ((((dem studium) OR (im studium))) or (das studium)) e filosofia de literatur".
• Adding a wildcard symbol may retrieve word variants: rest ((((dem studium) OR (im studium))) or (das studium)) e filosofia de literatur*.