Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
cases studied » cases studies, case studies, glasses studied
de filosofia » e filosofia, di filosofia, la filosofia
filosofia la » filosofia da, filosofia le, filosofica da
case studie » case studies, cases studies, case study

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: "sets ((case studie) OR (cases studied)) de filosofia la literatura*".