Perhaps you should try some spelling variations:
die filosofica » di filosofia, de filosofia, e filosofica
duale studien » duale studium, scale studien, duales studium
filosofica da » filosofia da, filosofia de, filosofia di
da literatura » la literatura, a literatura, de literatura
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: (testo OR test) duale studien die filosofica da literatura*.