Perhaps you should try some spelling variations:
cases studies » case studies, games studies
scale studien » scale studies, scale student, duale studien
de filosofia » e filosofia, di filosofia, la filosofia
e literatura » de literatura, y literatura, e literatur
filosofia e » filosofia de, 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 ((cases studies) OR (scale studien)) de filosofia e literatura.
• Adding a wildcard symbol may retrieve word variants: sets ((cases studies) or (scale studien)) de filosofia e literatura*.