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

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 de filosofia ((de literatura) OR (la literatura))*".