Perhaps you should try some spelling variations:
teoria semantica » teoria quantica, theories semantics, media semantic
storia critica » historia critica, teoria critica, stories critical
storia antica » storia gotica, storia romantica, historia antiga
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 critica))) OR (teoria semantica))%22.
• Adding a wildcard symbol may retrieve word variants: %contributo della%((istituto di) or (istituti di)) ((((storia antica) or (storia critica))) or (teoria semantica))%22*.