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

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