Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, e filosofia
y literatura » la literatura
studies die » studies does, studies dose, studies ds
filosofia y » filosofia e, filosofia _, filosofia de
tests case » test case, tests based, tests code
test cases » test case

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 case) OR (test cases)) studies die filosofia y literatura.
• Adding a wildcard symbol may retrieve word variants: ((tests case) or (test cases)) studies die filosofia y literatura*.