Perhaps you should try some spelling variations:
litterature author » literature author, literature authors, temperature author
letteratura arte » letteratura arti, letteratura sarda, letteratura e
de litterature » la litterature, et litterature
de letteratura » e letteratura, di letteratura, de litteratura
romani liber » romani sive
grani liber » glareani liber
i gran » i grand, i grain, i grani

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