Talvez deva tentar algumas variações de ortografia:
computer based » computer aided (Expandir a Pesquisa)
il computer » dal computer (Expandir a Pesquisa), vhdl computer (Expandir a Pesquisa)
natl camp » al camp (Expandir a Pesquisa), fat camp (Expandir a Pesquisa)
can never » than never (Expandir a Pesquisa), a never (Expandir a Pesquisa), has never (Expandir a Pesquisa)
based now » based snow (Expandir a Pesquisa), based non (Expandir a Pesquisa), based no2 (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
j natl » j nail (Expandir a Pesquisa), _ natl (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
a newt » _ newt (Expandir a Pesquisa), a news (Expandir a Pesquisa), a neat (Expandir a Pesquisa)
j il » j l (Expandir a Pesquisa), j i (Expandir a Pesquisa), j al (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": "(((( j natl camp can never ) OR ( j _ clamp a newt ))) OR ( j il computer based now ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j natl camp can never ) OR ( j _ clamp a newt ))) OR ( j il computer based now ))*.