Perhaps you should try some spelling variations:
storia romantica » storia romanza, storia politica, teoria semantica
storia antica » storia gotica, historia antiga, storia critica
istituto di » instituto de, instituto ad
istituti di » instituti di, istituti pii, istituiti sic
%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%((istituto di) OR (istituti di)) ((storia antica) OR (storia romantica))%22.
• The words AND, OR and NOT may confuse the search; try adding quotes: "%contributo della%((istituto di) or (istituti di)) ((storia antica) OR (storia romantica))%22".
• Adding a wildcard symbol may retrieve word variants: %contributo della%((istituto di) or (istituti di)) ((storia antica) OR (storia romantica))%22*.