Perhaps you should try some spelling variations:
della letteratura » nella letteratura
letteratura sarda » letteratura storia, letteratura sulla, letteratura arte
del letteratura » di letteratura, de litteratura, nella letteratura
e letteratura » y literatura, e literatur
ground libro » ground air, ground links, ground link
libro del » libro de
i grounde » i grunde, i grounds, _ grounde
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 sarda ) OR ( i grounde libri ((della letteratura) OR (e letteratura)) storia )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i ground libro del letteratura sarda ) or ( i grounde libri ((della letteratura) OR (e letteratura)) storia ))".
• Adding a wildcard symbol may retrieve word variants: (( i ground libro del letteratura sarda ) or ( i grounde libri ((della letteratura) OR (e letteratura)) storia ))*.