Talvez deva tentar algumas variações de ortografia:
cobalt complex » cobalt complexes (Expandir a Pesquisa)
cooper jason » cooper john (Expandir a Pesquisa), cooper alan (Expandir a Pesquisa), cooper james (Expandir a Pesquisa)
complex than » complex trait (Expandir a Pesquisa)
carlos roger » carlos rogerio (Expandir a Pesquisa), carlos romero (Expandir a Pesquisa), carlos robert (Expandir a Pesquisa)
know carlos » knopf carlos (Expandir a Pesquisa), dow carlos (Expandir a Pesquisa)
than ngoc » thanh ngoc (Expandir a Pesquisa), thuan ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa)
nacl know » nacl kno (Expandir a Pesquisa), nacl mno (Expandir a Pesquisa)
l cooper » _ cooper (Expandir a Pesquisa), a cooper (Expandir a Pesquisa)
5 cobalt » _ cobalt (Expandir a Pesquisa), a cobalt (Expandir a Pesquisa), 1 cobalt (Expandir a Pesquisa)
jason n » jason _ (Expandir a Pesquisa), jason a (Expandir a Pesquisa), jason c (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 cooper jason n ) or ((( 5 cobalt complex than ngoc ) or ( 0.9 nacl know carlos roger ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l cooper jason n ) OR ((( 5 cobalt complex than ngoc ) OR ( 0.9 nacl know carlos roger )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l cooper jason n ) or ((( 5 cobalt complex than ngoc ) or ( 0.9 nacl know carlos roger ))))*.