Perhaps you should try some spelling variations:
duales studium » das studium
e literatura » de literatura, y literatura, a literatura
e literatur » die literatur
studium la » studium a, studium als, studium das

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