Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
de letteratura » e letteratura, di letteratura, de litteratura
letteratura da » letteratura di, letteratura del, letteratura fra
grund libro » gran libro, und libro
i grund » i ground, i grand
die una » die und, die unep

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 libro de letteratura da ) OR ( i grunde ((die una) OR (die un)) letteratura sarda )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i grund libro de letteratura da ) or ( i grunde ((die una) OR (die un)) letteratura sarda ))".
• Adding a wildcard symbol may retrieve word variants: (( i grund libro de letteratura da ) or ( i grunde ((die una) OR (die un)) letteratura sarda ))*.