Perhaps you should try some spelling variations:
del contrasto » del contrato, del contratto, di contrasto
la republica » _ republican
di convegno » del convegno
il caso » el caso
republique » publique

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: di convegno ((del contrasto) OR (il caso)) zuccari / senato ((la republica) OR (la republique)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "di convegno ((del contrasto) or (il caso)) zuccari / senato ((la republica) OR (la republique))".
• Adding a wildcard symbol may retrieve word variants: di convegno ((del contrasto) or (il caso)) zuccari / senato ((la republica) OR (la republique))*.