Talvez deva tentar algumas variações de ortografia:
maple computer » apple computer (Expandir a Pesquisa), simple computer (Expandir a Pesquisa), mobile computer (Expandir a Pesquisa)
computer based » computer aided (Expandir a Pesquisa)
nat compared » fat compared (Expandir a Pesquisa), rat compared (Expandir a Pesquisa), cat compared (Expandir a Pesquisa)
compared can » compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa), companies can (Expandir a Pesquisa)
barr clamp » arm clamp (Expandir a Pesquisa)
based near » based next (Expandir a Pesquisa), based neural (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
j maple » _ maple (Expandir a Pesquisa), a maple (Expandir a Pesquisa)
l barr » el barr (Expandir a Pesquisa), l bark (Expandir a Pesquisa), l barros (Expandir a Pesquisa)
a netw » a neto (Expandir a Pesquisa), a neta (Expandir a Pesquisa), a netb (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 compared can new ) OR ( l barr clamp a netw ))) OR ( j maple computer based near ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( _ nat compared can new ) OR ( l barr clamp a netw ))) OR ( j maple computer based near ))*.