Perhaps you should try some spelling variations:
e letteratura » e literatur
y literatura » la literatura
grunde libro » grunde fir, grunde gibt, und libro
i grundei » i grunde, i grund
libri d » libri de, libri di, libri v

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