Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
texto duale » texto durante
studien der » studie der, studenten der
filosofia y » filosofia _, filosofia de, filosofia da
filosofia e » filosofia de, filosofia del

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