Perhaps you should try some spelling variations:
22contributi dell » contributo della, contributo delle, contributi dalla
27istituto di » istituto di
storia antica » storia gotica, storia romantica, historia antiga
istituti di » instituti di, istituto di, istituti pii

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• The words AND, OR and NOT may confuse the search; try adding quotes: "%22contributi dell%((27istituto di) OR (istituti di)) storia antica%22".
• Adding a wildcard symbol may retrieve word variants: %22contributi dell%((27istituto di) OR (istituti di)) storia antica%22*.