Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
da filosofia » la filosofia, di filosofia, a filosofia
studium da » studium das, studium a, studium d
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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((test day) OR (rest day)) studium da filosofia del litterature".
• Adding a wildcard symbol may retrieve word variants: ((test day) OR (rest day)) studium da filosofia del litterature*.