Perhaps you should try some spelling variations:
del letteratura » della letteratura, di letteratura, de litteratura
e letteratura » y literatura
grunde libri » grunde bei, grunde fir, grunde ii
magni libri » amandi libri
libri del » libro del, libri de, libri duo
_ magni » _ magnis, _ magna, _ magne

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 libri del letteratura e ) OR ( _ magni libri ((e letteratura) OR (e literatur)) sarda )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i grunde libri del letteratura e ) or ( _ magni libri ((e letteratura) OR (e literatur)) sarda ))".
• Adding a wildcard symbol may retrieve word variants: (( i grunde libri del letteratura e ) or ( _ magni libri ((e letteratura) OR (e literatur)) sarda ))*.