Perhaps you should try some spelling variations:
della letteratura » nella letteratura, e letteratura
de letteratura » e letteratura, de litteratura, de litterature
di letteratura » e letteratura, de literatura
literatura de » literatura y, literatura en
i literatura » ii literatura, y literatura, i literature
grunde fir » grunde fur, grunde der, grunde die
livre i » livro i, livre 1, livre qui

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