Perhaps you should try some spelling variations:
di literatura » de literatura, ii literatura, di letteratura
scale studies » scale study
da literatura » la literatura, a literatura, de literatura
de filosofia » e filosofia, di filosofia, la filosofia
als studien » aus studien, sals studies, als student

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 ((als studien) OR (scale studies)) de filosofia ((di literatura) OR (da literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "sets ((als studien) or (scale studies)) de filosofia ((di literatura) OR (da literatura))".
• Adding a wildcard symbol may retrieve word variants: sets ((als studien) or (scale studies)) de filosofia ((di literatura) OR (da literatura))*.