Talvez deva tentar algumas variações de ortografia:
based compared » based computed (Expandir a Pesquisa), based companies (Expandir a Pesquisa), based computer (Expandir a Pesquisa)
boys compared » boy compared (Expandir a Pesquisa), days compared (Expandir a Pesquisa), rays compared (Expandir a Pesquisa)
comb caused » coma caused (Expandir a Pesquisa), comb based (Expandir a Pesquisa), limb caused (Expandir a Pesquisa)
caused netw » caused death (Expandir a Pesquisa), caused fetal (Expandir a Pesquisa)
compared a » compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
a norreys » a norris (Expandir a Pesquisa), a nortes (Expandir a Pesquisa)
_ based » _ base (Expandir a Pesquisa), _ bases (Expandir a Pesquisa)
a comb » a combat (Expandir a Pesquisa)
j boys » j boyd (Expandir a Pesquisa), j bols (Expandir a Pesquisa), j bois (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 a comb caused netw ) OR ((( j boys compared a norreys ) OR ( _ based compared _ non ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j a comb caused netw ) OR ((( j boys compared a norreys ) OR ( _ based compared _ non ))))*.