Perhaps you should try some spelling variations:
de literatura » de litterature, la literatura, y literatura
duale studien » duale studium, scale studien, duales studium
es filosofia » e filosofia, la filosofia, di filosofia
em filosofia » e filosofia, la filosofia, di filosofia
texto duale » texto durante

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