Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, da filosofia
di literatura » de literatura, da literatura, ii literatura
case studie » case studies, cases studies, cases studied
e filosofia » la filosofia
tests case » test case, tests based, test cases

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: "tests case studie ((die filosofia) OR (e filosofia)) di literatura*".