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)
nino carlos » cano carlos (Expandir a Pesquisa), bacino carlos (Expandir a Pesquisa), semino carlos (Expandir a Pesquisa)
carlos nino » carlos patino (Expandir a Pesquisa), carlos merino (Expandir a Pesquisa), carlos nunez (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa), hobbs john (Expandir a Pesquisa)
john agnew » john bagnell (Expandir a Pesquisa)
tract ngo » tract new (Expandir a Pesquisa), tract nk (Expandir a Pesquisa), tract nts (Expandir a Pesquisa)
nacl nino » nacl nano (Expandir a Pesquisa), nacl kno (Expandir a Pesquisa), nacl mno (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa)
l combs » e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa), l comps (Expandir a Pesquisa)
5 metal » 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 john agnew ) OR ((( 5 metal complex tract ngo ) OR ( 3.5 nacl nino carlos nino ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l combs john agnew ) OR ((( 5 metal complex tract ngo ) OR ( 3.5 nacl nino carlos nino ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l combs john agnew ) OR ((( 5 metal complex tract ngo ) OR ( 3.5 nacl nino carlos nino ))))*.