Talvez deva tentar algumas variações de ortografia:
using computers » using computer (Expandir a Pesquisa), using computed (Expandir a Pesquisa), using computerized (Expandir a Pesquisa)
natl compared » nacl compared (Expandir a Pesquisa), nail compared (Expandir a Pesquisa), al compared (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
compared can » compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa), companies can (Expandir a Pesquisa)
computer a » computer _ (Expandir a Pesquisa)
sgj using » 6j using (Expandir a Pesquisa), j using (Expandir a Pesquisa), tmj using (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
j natl » j nail (Expandir a Pesquisa), _ natl (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), a nos (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: (((( _ nat computer a now ) or ( sgj using computers _ now ))) or ( j natl compared can now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( _ nat computer a now ) OR ( sgj using computers _ now ))) OR ( j natl compared can now )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( _ nat computer a now ) or ( sgj using computers _ now ))) or ( j natl compared can now ))*.