Perhaps you should try some spelling variations:
di literatura » de literatura, da literatura, ii literatura
filosofia di » filosofia de, filosofia da, filosofia del
sets scale » sets scaled, sets scales, set scale
tests safe » tests safety, tests scale, tests space
study la » study law, study lay, study lca

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 scale) OR (tests safe)) study la filosofia di literatura*.