Talvez deva tentar algumas variações de ortografia:
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
act compared » ct compared (Expandir a Pesquisa), pet compared (Expandir a Pesquisa), active compared (Expandir a Pesquisa)
computer a » computer _ (Expandir a Pesquisa)
nat camp » fat camp (Expandir a Pesquisa), cpt camp (Expandir a Pesquisa), cap camp (Expandir a Pesquisa)
camp ca » camp a (Expandir a Pesquisa), camp c (Expandir a Pesquisa), camp camp (Expandir a Pesquisa)
ca ngoc » can ngoc (Expandir a Pesquisa), cao ngoc (Expandir a Pesquisa), cam ngoc (Expandir a Pesquisa)
a ngoc » ha ngoc (Expandir a Pesquisa), ta ngoc (Expandir a Pesquisa), la ngoc (Expandir a Pesquisa)
2 nat » 2 nat2 (Expandir a Pesquisa), 2 nad (Expandir a Pesquisa), 2 nap (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
j act » _ act (Expandir a Pesquisa), 1 act (Expandir a Pesquisa), 3 act (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: (((( 2 nat computer a ngoc ) or ( _ nat camp ca ngoc ))) or ( j act compared _ netw ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 2 nat computer a ngoc ) OR ( _ nat camp ca ngoc ))) OR ( j act compared _ netw )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 2 nat computer a ngoc ) or ( _ nat camp ca ngoc ))) or ( j act compared _ netw ))*.