Perhaps you should try some spelling variations:
del literatura » de literatura, pela literatura, da literatura
scales study » scale study, cases study, scales sted
scalp study » scale study, casp study, scan study
a filosofia » la filosofia, e filosofia, di filosofia

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "sets ((scalp study) OR (scales study)) a filosofia del literatura".
• Adding a wildcard symbol may retrieve word variants: sets ((scalp study) OR (scales study)) a filosofia del literatura*.