Perhaps you should try some spelling variations:
di letteratura » e letteratura, della letteratura
de literatura » de litterature, la literatura, y literatura
literatura de » literatura y, literatura en
i grund » i grunde, i ground
i grand » i grunde
libro i » libro di

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