Perhaps you should try some spelling variations:
a litterature » la litterature, a literature, _ litterature
filosofia a » filosofia da, filosofia la, filosofia e
studium d » studium ad, studium _, studium 3
studium 1 » studium _, studium 3, studium 8

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: "text der ((studium d) OR (studium 1)) filosofia a litterature".
• Adding a wildcard symbol may retrieve word variants: text der ((studium d) OR (studium 1)) filosofia a litterature*.