Perhaps you should try some spelling variations:
duale studien » duale studium, scale studien, duales studium
die filosofia » di filosofia, de filosofia, e filosofia
la literatura » la litterature
texto duale » texto durante
studien die » studie die, 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 die filosofia ((la literatura) OR (a literature)).
• Adding a wildcard symbol may retrieve word variants: texto duale studien die filosofia ((la literatura) or (a literature))*.