Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, a literatura
y literatura » la literatura
des studium » des studiums, das studium, dein studium
dem studium » das studium, im studium, zum studium

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: text ((des studium) OR (dem studium)) la filosofia ((de literatura) OR (y literatura)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "text ((des studium) OR (dem studium)) la filosofia ((de literatura) or (y literatura))".
• Adding a wildcard symbol may retrieve word variants: text ((des studium) OR (dem studium)) la filosofia ((de literatura) or (y literatura))*.