Perhaps you should try some spelling variations:
a litterature » la litterature, _ litterature, et litterature
der studium » oder studium, dem studium, des studium
d filosofia » di filosofia, de filosofia, da filosofia
studium d » studium ad, studium _, studium 1

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