Perhaps you should try some spelling variations:
forming studies » folding studies, fleming studies, morning studies
costs forming » costs working, roots forming, costs sourcing
di literatura » de literatura, ii literatura, di letteratura
da literatura » la literatura, a literatura, de literatura
a filosofia » la filosofia, e filosofia, di filosofia

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: costs forming studies a filosofia ((di literatura) OR (da literatura)).
• Adding a wildcard symbol may retrieve word variants: costs forming studies a filosofia ((di literatura) or (da literatura))*.