Perhaps you should try some spelling variations:
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
den letteratura » di letteratura, de litteratura, della letteratura
e letteratura » y literatura, e literatur
magni libri » amandi libri
grunde der » grund der, grundzuge der, grundlage der
der den » wider den
_ magni » _ magnis, _ magna, _ magne
libri e » libri de, libri v, libri x

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 grunde der den letteratura e ) OR ( _ magni libri e letteratura sarda )).
• Adding a wildcard symbol may retrieve word variants: (( i grunde der den letteratura e ) or ( _ magni libri e letteratura sarda ))*.