Perhaps you should try some spelling variations:
storia politica » historia politica, teoria politica, storia critica
contributi alla » contributi dalla, contributo alla, contribute all
storia antica » storia gotica, storia romantica, historia antiga
istituto di » instituto de, 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: %contributi alla%((istituto di) OR (istituti di)) ((storia antica) OR (storia politica))%22.
• Adding a wildcard symbol may retrieve word variants: %contributi alla%((istituto di) or (istituti di)) ((storia antica) or (storia politica))%22*.