Perhaps you should try some spelling variations:
litterature author » literature author, literature authors, literature authorship
temperature author » temperatures author, temperature action, temperature after
letteratura arte » letteratura arti, letteratura sarda, letteratura e
de letteratura » e letteratura, di letteratura, de litteratura
graini liber » grain like, grain lines
grain libro » gran libro, grain fibril
i graini » i grani, i grafici, i grazing
liber de » liberte de
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 (temperature author)) ) OR ( i graini liber de letteratura arte )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( i grain libro de ((litterature author) OR (temperature author)) ) or ( i graini liber de letteratura arte ))".
• Adding a wildcard symbol may retrieve word variants: (( i grain libro de ((litterature author) OR (temperature author)) ) or ( i graini liber de letteratura arte ))*.