Perhaps you should try some spelling variations:
e letteratura » y literatura, e literatur
da filosofia » la filosofia, di filosofia, a filosofia
filosofia e » filosofia de, filosofia del
studium da » studium das, studium a, studium d
test das » test day, west das, testen das
test des » test der, test test

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 das) OR (test des)) studium da filosofia e letteratura".
• Adding a wildcard symbol may retrieve word variants: ((test das) OR (test des)) studium da filosofia e letteratura*.