Perhaps you should try some spelling variations:
di literatura » de literatura, da literatura, ii literatura
sals studies » goals studies, gels studies, aes studies
case studies » case study
di filosofia » la filosofia, e filosofia
filosofia di » filosofia de, filosofia da, filosofia del

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 ((sals studies) OR (case studies)) di filosofia di literatura.
• Adding a wildcard symbol may retrieve word variants: sets ((sals studies) or (case studies)) di filosofia di literatura*.