Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
letteratura fra » letteratura da, letteratura greca, letteratura arte
la letteratura » la litterature, la literatura, e letteratura
grunde fir » grunde fur, grunde der, grunde zur
grunde die » grunde der, grunde des, grundlage die
i grund » i grunde, i ground, i grand
libro e » libero e, libro i, libro _

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