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