Perhaps you should try some spelling variations:
litterature author » literature author, literature authors, temperature author
de litterature » la litterature, et litterature
de letteratura » di letteratura, de litteratura, de literatura
e letteratura » y literatura, e literatur
graini liber » grain like, grain lines
grain libro » gran libro, grain fibril
i graini » i grani, i grafici, i grazing
i grain » ii grain

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 grain libro de litterature author ) OR ( i graini liber ((de letteratura) OR (e letteratura)) arte )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i grain libro de litterature author ) or ( i graini liber ((de letteratura) OR (e letteratura)) arte ))".
• Adding a wildcard symbol may retrieve word variants: (( i grain libro de litterature author ) or ( i graini liber ((de letteratura) OR (e letteratura)) arte ))*.