Talvez deva tentar algumas variações de ortografia:
complex tract » complex trait (Expandir a Pesquisa), complex trace (Expandir a Pesquisa), complex extract (Expandir a Pesquisa)
metal complex » metal complexes (Expandir a Pesquisa)
knopf carlos » prof carlos (Expandir a Pesquisa)
combs bacon » com bacon (Expandir a Pesquisa), combs jason (Expandir a Pesquisa), combs brandon (Expandir a Pesquisa)
carlos nada » carlos nadaf (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos nara (Expandir a Pesquisa)
bacon neil » deacon neil (Expandir a Pesquisa), bacon new (Expandir a Pesquisa)
tract ngoc » tran ngoc (Expandir a Pesquisa), thach ngoc (Expandir a Pesquisa), tram ngoc (Expandir a Pesquisa)
nacl knopf » nacl kno (Expandir a Pesquisa)
l combs » e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa), l comps (Expandir a Pesquisa)
5 metal » 5 metil (Expandir a Pesquisa), 5 methyl (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 combs bacon neil ) or ((( 5 metal complex tract ngoc ) or ( 0.9 nacl knopf carlos nada ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l combs bacon neil ) OR ((( 5 metal complex tract ngoc ) OR ( 0.9 nacl knopf carlos nada )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l combs bacon neil ) or ((( 5 metal complex tract ngoc ) or ( 0.9 nacl knopf carlos nada ))))*.