Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex tran » complex trans (Expandir a Pesquisa), complex than (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
knopf carlos » prof carlos (Expandir a Pesquisa)
carlos jama » carlos gama (Expandir a Pesquisa), carlos jara (Expandir a Pesquisa), carlos rama (Expandir a Pesquisa)
bacon neil » deacon neil (Expandir a Pesquisa), bacon new (Expandir a Pesquisa)
nacl knopf » nacl kno (Expandir a Pesquisa)
c.m bacon » com bacon (Expandir a Pesquisa), c.m bach (Expandir a Pesquisa), ham bacon (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa)
5 metal » 5 methyl (Expandir a Pesquisa)
l c.m » l com (Expandir a Pesquisa), l cam (Expandir a Pesquisa), _ c.m (Expandir a Pesquisa)
ngoc » ngo (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 c.m bacon neil ) or ((( 5 metal complex tran ngoc ) or ( 3.5 nacl knopf carlos jama ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l c.m bacon neil ) OR ((( 5 metal complex tran ngoc ) OR ( 3.5 nacl knopf carlos jama )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l c.m bacon neil ) or ((( 5 metal complex tran ngoc ) or ( 3.5 nacl knopf carlos jama ))))*.