Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
filosofia die » filosofia de, filosofia del, filosofia e
filosofia di » filosofia de, filosofia da, filosofia del
texto duale » texto durante
studien da » studien das, studien dar, studien a

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "texto duale studien da ((filosofia die) OR (filosofia di)) literatur*".