Perhaps you should try some spelling variations:
de litteratura » de litterature, de literatura, da literatura
literatura de » literatura y, literatura en
e letteratura » y literatura, e literatur
libri di » libri ii, libri de, libri iii
i grand » i grunde
i gran » i grain, i grani, i gram

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