Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
auf studium » fur studium, als studium, beruf studium
1 filosofia » e filosofia, a filosofia, y filosofia
ak studium » das studium, als studium, im studium

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: "west ((ak studium) OR (auf studium)) 1 filosofia del litterature".
• Adding a wildcard symbol may retrieve word variants: west ((ak studium) OR (auf studium)) 1 filosofia del litterature*.