Perhaps you should try some spelling variations:
during studie » during studies, during study, during soldier
di literatura » da literatura, ii literatura, di letteratura
de literatura » de litterature, la literatura, y literatura
costs during » costs using
di filosofia » la filosofia, e filosofia
studie di » studie die, studie d, studie de

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 during studie di filosofia ((di literatura) OR (de literatura)).
• Adding a wildcard symbol may retrieve word variants: costs during studie di filosofia ((di literatura) or (de literatura))*.