Perhaps you should try some spelling variations:
de letteratura » e letteratura, di letteratura, de litterature
de litteratura » de litterature, de literatura, e letteratura
literatura de » literatura y, literatura en
i grundei » i grunde, i grund
i gran » i grand, i grain, i grani

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