Perhaps you should try some spelling variations:
estudo de » estudio de, estudos de, estado de
estudi de » estudio de, estudis de, estudios de
"studi di saggi" » "studi de saggi", "studi di viaggi", "studi e saggi"
studi de » studi del, studie de, studio de

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 di saggi") OR ("((studi de) or (((estudi de) OR (estudo de)))) saggi")).
• Removing quotes may allow a broader search: (( studi di saggi ) or ( ((studi de) or (((estudi de) OR (estudo de)))) saggi )).
• Adding a wildcard symbol may retrieve word variants: (("studi di saggi") or ("((studi de) or (((estudi de) OR (estudo de)))) saggi"))*.