Perhaps you should try some spelling variations:
y literatura » la literatura
der studium » oder studium, des studium, dein studium
dem studium » das studium, im studium, zum studium
y filosofia » e filosofia, a filosofia, di filosofia

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 ((der studium) OR (dem studium)) ((y filosofia) OR (la filosofia)) y literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "text ((der studium) or (dem studium)) ((y filosofia) OR (la filosofia)) y literatura".
• Adding a wildcard symbol may retrieve word variants: text ((der studium) or (dem studium)) ((y filosofia) OR (la filosofia)) y literatura*.