Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
filosofia de » filosofia del
texto duale » texto durante
filologia y » filologia e, filologica e, filosofia y
studien di » studien die, studien dd, studien der

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 duale studien di ((filologia y) OR (filosofia de)) literatura.
• Adding a wildcard symbol may retrieve word variants: texto duale studien di ((filologia y) or (filosofia de)) literatura*.