Perhaps you should try some spelling variations:
states studies » state studies, states studied, stage studies
tales studies » games studies, cases studies, tales stories
de filosofia » e filosofia, di filosofia, la filosofia
e literatura » de literatura, y literatura, e literatur
filosofia e » filosofia de, filosofia del

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: "los ((tales studies) OR (states studies)) de filosofia e literatura*".