Talvez deva tentar algumas variações de ortografia:
based compared » based computed (Expandir a Pesquisa), based companies (Expandir a Pesquisa), based computer (Expandir a Pesquisa)
compra caused » coma caused (Expandir a Pesquisa), cholera caused (Expandir a Pesquisa), complex caused (Expandir a Pesquisa)
caused fetal » causes fetal (Expandir a Pesquisa), caused fatal (Expandir a Pesquisa), cause fetal (Expandir a Pesquisa)
pcr compared » pcr coupled (Expandir a Pesquisa), pcr combined (Expandir a Pesquisa)
compared a » compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
da compra » de compra (Expandir a Pesquisa), la compra (Expandir a Pesquisa)
_ based » _ base (Expandir a Pesquisa), _ bases (Expandir a Pesquisa)
j pcr » _ pcr (Expandir a Pesquisa), a pcr (Expandir a Pesquisa), q pcr (Expandir a Pesquisa)
j da » j a (Expandir a Pesquisa), j d (Expandir a Pesquisa), j de (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j da compra caused fetal ) or ((( j pcr compared _ nortes ) or ( _ based compared a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j da compra caused fetal ) OR ((( j pcr compared _ nortes ) OR ( _ based compared a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j da compra caused fetal ) or ((( j pcr compared _ nortes ) or ( _ based compared a new ))))*.