Perhaps you should try some spelling variations:
filosofica da » filosofia da, filosofia de, filosofia di
case studies » case study
filosofia e » filosofia de, filosofia del
tests case » test case, tests based, test cases
studies de » studies der, studies die, studies doe

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 studies de ((filosofica da) OR (filosofia e)) literatura.
• Adding a wildcard symbol may retrieve word variants: tests case studies de ((filosofica da) or (filosofia e)) literatura*.