Talvez deva tentar algumas variações de ortografia:
methanol cobalt » methane cobalt (Expandir a Pesquisa), ethane cobalt (Expandir a Pesquisa), methanol complex (Expandir a Pesquisa)
julio carlos » rio carlos (Expandir a Pesquisa)
cobalt thin » cobalt trial (Expandir a Pesquisa)
carlos nara » carlos lara (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos jara (Expandir a Pesquisa)
coombs con » coombs john (Expandir a Pesquisa), coombs ian (Expandir a Pesquisa), coombs c (Expandir a Pesquisa)
_ methanol » _ methane (Expandir a Pesquisa)
thin ngoc » thien ngoc (Expandir a Pesquisa), thinh ngoc (Expandir a Pesquisa), thi ngoc (Expandir a Pesquisa)
m coombs » m coombes (Expandir a Pesquisa), g coombs (Expandir a Pesquisa), _ coombs (Expandir a Pesquisa)
con net » con nee (Expandir a Pesquisa), non net (Expandir a Pesquisa), upon net (Expandir a Pesquisa)
nacl » natl (Expandir a Pesquisa), nac (Expandir a Pesquisa), nucl (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 m coombs con net ) or ((( _ methanol cobalt thin ngoc ) or ( 0.9 nacl julio carlos nara ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j m coombs con net ) OR ((( _ methanol cobalt thin ngoc ) OR ( 0.9 nacl julio carlos nara )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j m coombs con net ) or ((( _ methanol cobalt thin ngoc ) or ( 0.9 nacl julio carlos nara ))))*.