Perhaps you should try some spelling variations:
die filosofia » di filosofia, de filosofia, e filosofia
de literatura » de litterature, la literatura, y literatura
duale studie » duale studien, duale studium, duales studium
filosofia de » filosofia del
studie die » studie der

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "(testo OR tests) duale studie die filosofia de literatura".
• Adding a wildcard symbol may retrieve word variants: (testo OR tests) duale studie die filosofia de literatura*.