Talvez deva tentar algumas variações de ortografia:
computer based » computer aided (Expandir a Pesquisa)
dal computer » dental computer (Expandir a Pesquisa), small computer (Expandir a Pesquisa), local computer (Expandir a Pesquisa)
natl camp » al camp (Expandir a Pesquisa)
had never » has never (Expandir a Pesquisa), have never (Expandir a Pesquisa), a never (Expandir a Pesquisa)
clamp cum » clamp m (Expandir a Pesquisa), clamp can (Expandir a Pesquisa), clamp em (Expandir a Pesquisa)
cum newts » can newts (Expandir a Pesquisa)
camp had » camp chad (Expandir a Pesquisa), camp has (Expandir a Pesquisa), camp have (Expandir a Pesquisa)
a clamp » _ clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa), a claims (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
j dal » j dale (Expandir a Pesquisa), j daly (Expandir a Pesquisa), j del (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 had never ) OR ( j a clamp cum newts ))) OR ( j dal computer based non ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j natl camp had never ) OR ( j a clamp cum newts ))) OR ( j dal computer based non ))*.