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

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