Talvez deva tentar algumas variações de ortografia:
computers can » computers a (Expandir a Pesquisa), computers _ (Expandir a Pesquisa)
a computers » a computer's (Expandir a Pesquisa), a computer (Expandir a Pesquisa), _ computers (Expandir a Pesquisa)
nacl colex » nacl complex (Expandir a Pesquisa)
colex care » complex care (Expandir a Pesquisa), cole clare (Expandir a Pesquisa), colen carl (Expandir a Pesquisa)
care now » care new (Expandir a Pesquisa)
nacl co » nacl co2 (Expandir a Pesquisa), nacl kcl (Expandir a Pesquisa), nacl kno (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
3 nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa)
co can » co con (Expandir a Pesquisa), co canal (Expandir a Pesquisa), co chain (Expandir a Pesquisa)
a nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), a naci (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( 3 nacl co can now ) OR ( a nacl colex care now ))) OR ( j a computers can now ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 3 nacl co can now ) OR ( a nacl colex care now ))) OR ( j a computers can now ))*.