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

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 studie) OR (cases studied)) de filosofica da literatura*.