Perhaps you should try some spelling variations:
estudis de » estudios de, estudio de, estudos de
estudi de » estudio de, estudo de, estudios de
studi de » studi del, 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 (((estudi de) OR (estudis de)))) saggi")).
• Removing quotes may allow a broader search: (( studi e saggi ) or ( ((studi de) or (((estudi de) OR (estudis de)))) saggi )).
• Adding a wildcard symbol may retrieve word variants: (("studi e saggi") or ("((studi de) or (((estudi de) OR (estudis de)))) saggi"))*.