Perhaps you should try some spelling variations:
contributor della » contributo della, contributo delle, contributor delete
historia antiga » historia antigua, historia antiqua
instituto de » institut der, institution der
istituto di » instituto ad
istituti di » instituti di, istituti pii, istituiti sic

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: %contributor della%((((istituto di) OR (instituto de))) OR (istituti di)) ((historia antiga) OR (historia argentina))%22.
• Adding a wildcard symbol may retrieve word variants: %contributor della%((((istituto di) or (instituto de))) or (istituti di)) ((historia antiga) or (historia argentina))%22*.