Perhaps you should try some spelling variations:
scale studies » scale study
case studies » case study
a filosofica » a filosofia, e filosofica, la filosofia
filosofica a » filosofica da, filosofica e, filosofica _
a literatura » la literatura, a literature, y literatura

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: set ((scale studies) OR (case studies)) a filosofica a literatura.
• Adding a wildcard symbol may retrieve word variants: set ((scale studies) or (case studies)) a filosofica a literatura*.