Perhaps you should try some spelling variations:
la literatura » la litterature, a literature
filosofia la » filosofia da, filosofia le, filosofica da
testi delle » tesi delle, test delle, testi della
studien die » studie die, studien der
studien di » studien dd, studien der, studien bei

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: testi delle ((studien di) OR (studien die)) filosofia la literatura.
• Adding a wildcard symbol may retrieve word variants: testi delle ((studien di) or (studien die)) filosofia la literatura*.