Perhaps you should try some spelling variations:
di literatura » de literatura, da literatura, di letteratura
ii literatura » ii literatur, ii literature, iii literature
tests data » test data, lists data, testing data
studium e » studium 1, studium 3, studium 8

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: tests data ((studium e) OR (studium _)) filosofia ((di literatura) OR (ii literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tests data ((studium e) OR (studium _)) filosofia ((di literatura) or (ii literatura))".
• Adding a wildcard symbol may retrieve word variants: tests data ((studium e) OR (studium _)) filosofia ((di literatura) or (ii literatura))*.