Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
letteratura arti » letteratura arte, letteratura di, letteratura fra
grand libri » gran libro, amandi libri

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 ((grand libri) OR (grand livre)) della ((letteratura arti) OR (letteratura sarda)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "i ((grand libri) or (grand livre)) della ((letteratura arti) OR (letteratura sarda))".
• Adding a wildcard symbol may retrieve word variants: i ((grand libri) or (grand livre)) della ((letteratura arti) OR (letteratura sarda))*.