Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura
a literatura » la literatura, a literature, a literatur
y literatura » la literatura
studium la » studium a, studium als, studium das
text das » text des, text data, text der

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