Talvez deva tentar algumas variações de ortografia:
computer case » computer based (Expandir a Pesquisa), computer code (Expandir a Pesquisa), computer can (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
compra can » compra con (Expandir a Pesquisa), compra en (Expandir a Pesquisa), compra da (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa), nat comm (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
d compra » de compra (Expandir a Pesquisa), da compra (Expandir a Pesquisa), a compra (Expandir a Pesquisa)
case new » cases new (Expandir a Pesquisa), cause new (Expandir a Pesquisa), caste new (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
nets » news (Expandir a Pesquisa), net (Expandir a Pesquisa), neto (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 compr can (netw OR nets) ) or ( j d compra can new ))) or ( _ nat computer case new ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( _ nat compr can (netw OR nets) ) OR ( j d compra can new ))) OR ( _ nat computer case new ))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( _ nat compr can (netw OR nets) ) or ( j d compra can new ))) or ( _ nat computer case new ))*".