Perhaps you should try some spelling variations:
della letteratura » nella letteratura
letteratura di » letteratura e, literatura de
e letteratura » y literatura, e literatur
grand libro » gran libro, grand livre
fir del » fiar del, fir model, firme del
fir den » fair den, wir den, mir den

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 ((fir del) OR (fir den)) letteratura di ) OR ( i grand libro ((della letteratura) OR (e letteratura)) storia )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i grunde ((fir del) or (fir den)) letteratura di ) or ( i grand libro ((della letteratura) OR (e letteratura)) storia ))".
• Adding a wildcard symbol may retrieve word variants: (( i grunde ((fir del) or (fir den)) letteratura di ) or ( i grand libro ((della letteratura) OR (e letteratura)) storia ))*.