Perhaps you should try some spelling variations:
studi de » estudi de, studi del, studie de
"Studi de saggi" » "Studi di saggi", "Studi de sang", "Studi ddi saggi"
"Studi de santi" » "Studi de santis", "Studi de sante", "Studi de santa"
"studi e saggi" » "studi _ saggi", "studi di 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 saggi") OR ("Studi de santi")))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"studi e saggi\") or (((\"Studi de saggi\") OR (\"Studi de santi\"))))".
• Removing quotes may allow a broader search: (( studi e saggi ) or ((( Studi de saggi ) OR ( Studi de santi )))).
• Adding a wildcard symbol may retrieve word variants: (("studi e saggi") or ((("Studi de saggi") OR ("Studi de santi"))))*.