Perhaps you should try some spelling variations:
filosofia da » filosofia de, filosofia del, filosofia e
der studium » oder studium, dem studium, des studium
filosofia a » filosofia la, filosofia e, 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: (test OR text) der studium d ((filosofia a) OR (filosofia da)) litterature.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(test OR text) der studium d ((filosofia a) or (filosofia da)) litterature".
• Adding a wildcard symbol may retrieve word variants: (test OR text) der studium d ((filosofia a) or (filosofia da)) litterature*.