Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
literatur greca » literatura graeca, literatura grega, literaturas grecia
la letteratura » la litterature, la literatura, e letteratura
grunde die » grunde der, grunde des, grundlage die
und libro » und librosa, und lido
un libro » el libro, il libro, _ libro
die la » die lan, die lage, die land

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