Perhaps you should try some spelling variations:
stories critical » studies critical, theories critical, sources critical
contributo alla » contributi alla, contributo allo, contributo della
instituto ad » instituto de, instituto _, institutos de
istituti di » instituti di, istituto di, istituti pii

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 alla%((instituto ad) OR (istituti di)) stories critical%22.
• Adding a wildcard symbol may retrieve word variants: %contributo alla%((instituto ad) or (istituti di)) stories critical%22*.