Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, e filosofia
de literatura » de litterature, la literatura, y literatura
tests during » protests during, testing during, forests during
costs during » costs using
filosofia de » filosofia del
studie die » studie der

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: ((tests during) OR (costs during)) studie die filosofia de literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests during) or (costs during)) studie die filosofia de literatura*.