Talvez deva tentar algumas variações de ortografia:
based companies » based composites (Expandir a Pesquisa), listed companies (Expandir a Pesquisa), based comparison (Expandir a Pesquisa)
companies lean » companies can (Expandir a Pesquisa), companies less (Expandir a Pesquisa), companies deal (Expandir a Pesquisa)
caused death » cause death (Expandir a Pesquisa), causes death (Expandir a Pesquisa), based death (Expandir a Pesquisa)
pcr compared » pcr coupled (Expandir a Pesquisa), pcr combined (Expandir a Pesquisa)
coma caused » sarcoma caused (Expandir a Pesquisa), eczema caused (Expandir a Pesquisa), edema caused (Expandir a Pesquisa)
lean new » learn new (Expandir a Pesquisa), mean new (Expandir a Pesquisa), ocean new (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)
mc pcr » mt pcr (Expandir a Pesquisa), dc pcr (Expandir a Pesquisa), ms 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 ((( mc pcr compared _ nortes ) or ( _ based companies lean new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l coma caused death ) OR ((( mc pcr compared _ nortes ) OR ( _ based companies lean new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l coma caused death ) or ((( mc pcr compared _ nortes ) or ( _ based companies lean new ))))*.