Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
a filosofia » la filosofia, e filosofia, di filosofia
tests case » tests based, test cases, tests code
tests » texts
test » text

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) OR (test case)) studies a filosofia del literatura*".