Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
das filosofia » da filosofia, la filosofia, di filosofia
studium das » studium des, studium der, studium die
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 das filosofia del litterature.
• Adding a wildcard symbol may retrieve word variants: ((test day) or (rest day)) studium das filosofia del litterature*.