Talvez deva tentar algumas variações de ortografia:
computer based » computer aided (Expandir a Pesquisa)
local computer » novel computer (Expandir a Pesquisa), medical computer (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
computer a » computer _ (Expandir a Pesquisa)
based snow » based snp (Expandir a Pesquisa)
nat comp » et comp (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
j local » bmj local (Expandir a Pesquisa), j locane (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), e nat (Expandir a Pesquisa), j nay (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": "(( _ nat comp can near ) OR ((( j nat computer a new ) OR ( j local computer based snow ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ nat comp can near ) OR ((( j nat computer a new ) OR ( j local computer based snow ))))*.