Perhaps you should try some spelling variations:
duale studien » scale studien, duales studium, dualen studium
duale studium » duales studium, dualen studium, das studium
e literatura » de literatura, y literatura, a literatura
literatura » literaturea
literatur » literature

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: test ((duale studien) OR (duale studium)) _ filologia ((e literatura) OR (e literatur)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "test ((duale studien) or (duale studium)) _ filologia ((e literatura) OR (e literatur))".
• Adding a wildcard symbol may retrieve word variants: test ((duale studien) or (duale studium)) _ filologia ((e literatura) OR (e literatur))*.