Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
di filosofia » la filosofia, e filosofia
studium di » studium die, studium i, studium ii
test day » test data, feast day, fast day
rest day » great day, feast day, rest data

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: ((test day) OR (rest day)) studium di filosofia del litterature.
• Adding a wildcard symbol may retrieve word variants: ((test day) or (rest day)) studium di filosofia del litterature*.