Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
duale studien » duale studium, scale studien, duales studium
de filosofia » e filosofia, di filosofia, la filosofia
filosofia la » filosofia da, filosofia le, filosofica da
studien de » studien der, 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: (testo OR test) duale studien de filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: (testo or test) duale studien de filosofia la literatura*.