Perhaps you should try some spelling variations:
storia antica » storia gotica, storia romantica, historia antiga
instituto ad » instituto de, instituto _, institutos de
istituti di » instituti di, istituto di, istituti pii
%contributo » %contributor, %contribute, %contributi

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: %contributo della%((instituto ad) OR (istituti di)) storia antica%22.
• Adding a wildcard symbol may retrieve word variants: %contributo della%((instituto ad) or (istituti di)) storia antica%22*.