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

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: "text der studium ((da filosofia) OR (a filosofia)) da litterature*".