Perhaps you should try some spelling variations:
estudi de » estudio de, estudis de, estudo de
"studi de saggi" » "studi del saggi", "studie de saggi", "studio de saggi", "studi di saggi", "studi e saggi", "studi de sang"
"studi de santi" » "studi del santi", "studie de santi", "studio de santi", "studi de santis", "studi de sante", "studi de santa"

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 de saggi") OR ("studi de santi"))) OR ("((studi de) or (estudi de)) saggi")).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((((\"studi de saggi\") OR (\"studi de santi\"))) or (\"((studi de) or (estudi de)) saggi\"))".
• Removing quotes may allow a broader search: (((( studi de saggi ) OR ( studi de santi ))) or ( ((studi de) or (estudi de)) saggi )).
• Adding a wildcard symbol may retrieve word variants: (((("studi de saggi") OR ("studi de santi"))) or ("((studi de) or (estudi de)) saggi"))*.