Perhaps you should try some spelling variations:
della letteratura » nella letteratura, e letteratura
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
grand libri » grand livre, gran libro

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 (amandi libri))) OR (magni libri)) della letteratura sarda.
• Adding a wildcard symbol may retrieve word variants: i ((((grand libri) or (amandi libri))) or (magni libri)) della letteratura sarda*.