Talvez deva tentar algumas variações de ortografia:
policy comparing » police comparing (Expandir a Pesquisa), policy competing (Expandir a Pesquisa), policies comparing (Expandir a Pesquisa)
comparing trial » comparing total (Expandir a Pesquisa), comparison trial (Expandir a Pesquisa), comparing time (Expandir a Pesquisa)
nare companies » care companies (Expandir a Pesquisa), name companies (Expandir a Pesquisa), large companies (Expandir a Pesquisa)
computers a » computers _ (Expandir a Pesquisa)
companies a » companies _ (Expandir a Pesquisa)
trial non » trials non (Expandir a Pesquisa), triad non (Expandir a Pesquisa), trial noa (Expandir a Pesquisa)
i policy » ai policy (Expandir a Pesquisa), di policy (Expandir a Pesquisa), _ policy (Expandir a Pesquisa)
_ nare » _ nares (Expandir a Pesquisa), _ narp (Expandir a Pesquisa), _ nara (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( i _ computers a new ) or ((( _ nare companies a new ) or ( i policy comparing trial non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( i _ computers a new ) OR ((( _ nare companies a new ) OR ( i policy comparing trial non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( i _ computers a new ) or ((( _ nare companies a new ) or ( i policy comparing trial non ))))*.