Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arti
letteratura arte » letteratura arti, letteratura e, letteratura fra
grandi libri » amandi libri, grandi liberali, grandi list

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: i ((grandi libri) OR (gran libro)) della ((letteratura sarda) OR (letteratura arte)).
• Adding a wildcard symbol may retrieve word variants: i ((grandi libri) or (gran libro)) della ((letteratura sarda) or (letteratura arte))*.