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