Perhaps you should try some spelling variations:
da litterature » la litterature, de litterature, a litterature
da filosofia » la filosofia, di filosofia, de filosofia
a filosofia » la filosofia, e filosofia, di filosofia
de studium » dem studium, des studium, d studium
test de » test der, test des, est de

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 de studium ((da filosofia) OR (a filosofia)) da litterature".
• Adding a wildcard symbol may retrieve word variants: test de studium ((da filosofia) OR (a filosofia)) da litterature*.