Perhaps you should try some spelling variations:
studie des » studie der, studium des, studie die
studi del » studio del, studi della, studio dell
studi de » estudi de, studie de, studio de
"studi e saggi" » "studi _ saggi", "studi di saggi", "studi de saggi"

Try widening your search to All Fields.

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: (("studi e saggi") OR ("((((studi de) OR (studi del))) or (studie des)) saggi")).
• Removing quotes may allow a broader search: (( studi e saggi ) or ( ((((studi de) OR (studi del))) or (studie des)) saggi )).
• Adding a wildcard symbol may retrieve word variants: (("studi e saggi") or ("((((studi de) OR (studi del))) or (studie des)) saggi"))*.