Perhaps you should try some spelling variations:
literature sarda » literature search, letteratura sarda, literature sacred
literatur greca » literatura graeca, literatura grega, literaturas grecia
grunde die » grunde der, grunde des, grundlage die
und libro » un libro, und librosa, und lido
libro e » libro de, libero e, libro i
i und » _ und, 1 und, 2 und
die a » die _, die 7, die 5

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 e literatur greca ) OR ( i grunde die a literature sarda )).
• Adding a wildcard symbol may retrieve word variants: (( i und libro e literatur greca ) or ( i grunde die a literature sarda ))*.