Talvez deva tentar algumas variações de ortografia:
complex trace » complex traces (Expandir a Pesquisa), complex tracks (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
metal complex » metal complexes (Expandir a Pesquisa)
nuno carlos » nino carlos (Expandir a Pesquisa), nunes carlos (Expandir a Pesquisa), bueno carlos (Expandir a Pesquisa)
carlos nino » carlos patino (Expandir a Pesquisa), carlos merino (Expandir a Pesquisa), carlos nunez (Expandir a Pesquisa)
combs jan » coombs jana (Expandir a Pesquisa), combs john (Expandir a Pesquisa), combs j (Expandir a Pesquisa)
trace ngo » trace n (Expandir a Pesquisa), trace non (Expandir a Pesquisa)
nacl nuno » nacl nano (Expandir a Pesquisa), nacl kno (Expandir a Pesquisa), nacl mno (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
e combs » sex combs (Expandir a Pesquisa)
jan net » dan net (Expandir a Pesquisa), can net (Expandir a Pesquisa), jan nel (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 e combs jan net ) or ((( 5 metal complex trace ngo ) or ( 3.5 nacl nuno carlos nino ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j e combs jan net ) OR ((( 5 metal complex trace ngo ) OR ( 3.5 nacl nuno carlos nino )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j e combs jan net ) or ((( 5 metal complex trace ngo ) or ( 3.5 nacl nuno carlos nino ))))*.