Talvez deva tentar algumas variações de ortografia:
computer cause » computer case (Expandir a Pesquisa), computer course (Expandir a Pesquisa), computer use (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
salt company » holt company (Expandir a Pesquisa), salient company (Expandir a Pesquisa), ballet company (Expandir a Pesquisa)
company law » company a (Expandir a Pesquisa)
cause new » causes new (Expandir a Pesquisa), use new (Expandir a Pesquisa), cause non (Expandir a Pesquisa)
nat camp » fat camp (Expandir a Pesquisa), a camp (Expandir a Pesquisa), cpt camp (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
law note » law notes (Expandir a Pesquisa), law noise (Expandir a Pesquisa)
e nat » e nata (Expandir a Pesquisa), e nao (Expandir a Pesquisa), e nas (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": "(((( e nat computer cause new ) OR ( e nat camp can new ))) OR ( j salt company law note ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( e nat computer cause new ) OR ( e nat camp can new ))) OR ( j salt company law note ))*.