Perhaps you should try some spelling variations:
y literatura » la literatura
texto duale » texto durante
studien der » studie der, studenten der
filologia y » filologia e, filologica e, filosofia y
studien di » studien die, studien bei, studien des
studien dd » studies dd, studien die, studien des

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) OR (studien der))) OR (studien dd)) filologia y literatura.
• The words AND, OR and NOT may confuse the search; try adding quotes: "texto duale ((((studien di) OR (studien der))) or (studien dd)) filologia y literatura".
• Adding a wildcard symbol may retrieve word variants: texto duale ((((studien di) OR (studien der))) or (studien dd)) filologia y literatura*.