Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
texto duale » texto durante
filologia y » filologica e, filosofia y, biologia y
filologia e » filologica e, fisiologia e, filologici e
studien dd » studies dd, studien der, studien die

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 dd ((filologia y) OR (filologia e)) literatura".
• Adding a wildcard symbol may retrieve word variants: texto duale studien dd ((filologia y) OR (filologia e)) literatura*.