Perhaps you should try some spelling variations:
del litterature » de litterature, des litteratures, et litterature
da filosofia » la filosofia, a filosofia, de filosofia
di filosofia » la filosofia, e filosofia
der studium » oder studium, dem studium, des studium
test » text

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 der studium ((da filosofia) OR (di filosofia)) del litterature*".