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)
computed can » computer can (Expandir a Pesquisa), computers can (Expandir a Pesquisa), computed pain (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa)
anc netw » soc netw (Expandir a Pesquisa), nc net (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
case new » cases new (Expandir a Pesquisa), cause new (Expandir a Pesquisa), caste new (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)

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": "(((( 2 nat compr anc netw ) OR ( j _ computed can netw ))) OR ( _ nat computer case new ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 2 nat compr anc netw ) OR ( j _ computed can netw ))) OR ( _ nat computer case new ))*.