Perhaps you should try some spelling variations:
e filosofica » e filosofia, e filosofiche, a filosofia
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura
studien e » studien es, studien _, studien 3

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 act) OR (test a)) studien e filosofica a literatura.
• Adding a wildcard symbol may retrieve word variants: ((test act) or (test a)) studien e filosofica a literatura*.