Perhaps you should try some spelling variations:
nella letteratura » della letteratura
della literatura » della letteratura, pela literatura, la literatura
del letteratura » della letteratura, di letteratura, de litteratura
e letteratura » y literatura, e literatur
ground libro » ground air, ground links, ground link
_ grounde » _ grounded, _ ground, _ grounds
i ground » i group, i groups, i grunde

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 ground libro ((del letteratura) OR (e letteratura)) sarda ) OR ( _ grounde libri ((della literatura) OR (nella letteratura)) historia )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i ground libro ((del letteratura) or (e letteratura)) sarda ) or ( _ grounde libri ((della literatura) OR (nella letteratura)) historia ))".
• Adding a wildcard symbol may retrieve word variants: (( i ground libro ((del letteratura) or (e letteratura)) sarda ) or ( _ grounde libri ((della literatura) OR (nella letteratura)) historia ))*.