Talvez deva tentar algumas variações de ortografia:
companies ocean » companies can (Expandir a Pesquisa), companies lean (Expandir a Pesquisa), companies deal (Expandir a Pesquisa)
based companies » based composites (Expandir a Pesquisa), listed companies (Expandir a Pesquisa), based complexes (Expandir a Pesquisa)
caused death » cause death (Expandir a Pesquisa), causes death (Expandir a Pesquisa), cause deaths (Expandir a Pesquisa)
pcr compared » pcr combined (Expandir a Pesquisa)
coma caused » coma case (Expandir a Pesquisa), sarcoma caused (Expandir a Pesquisa), eczema caused (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
a nortes » a norte (Expandir a Pesquisa), a norreys (Expandir a Pesquisa), a north (Expandir a Pesquisa)
_ based » _ base (Expandir a Pesquisa), _ bases (Expandir a Pesquisa)
l coma » l comas (Expandir a Pesquisa), l como (Expandir a Pesquisa), l coca (Expandir a Pesquisa)
c pcr » dc pcr (Expandir a Pesquisa), mc pcr (Expandir a Pesquisa), 3c pcr (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 l coma caused death ) or ((( c pcr compared a nortes ) or ( _ based companies ocean new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l coma caused death ) OR ((( c pcr compared a nortes ) OR ( _ based companies ocean new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l coma caused death ) or ((( c pcr compared a nortes ) or ( _ based companies ocean new ))))*.