Talvez deva tentar algumas variações de ortografia:
complexes during » complex during (Expandir a Pesquisa), complexes using (Expandir a Pesquisa)
metil complexes » metal complexes (Expandir a Pesquisa), metals complexes (Expandir a Pesquisa), axetil complexes (Expandir a Pesquisa)
during ngoc » duong ngoc (Expandir a Pesquisa), during neo (Expandir a Pesquisa), dung ngoc (Expandir a Pesquisa)
nano carlos » cano carlos (Expandir a Pesquisa), nino carlos (Expandir a Pesquisa), nuno carlos (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), combes john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa)
nacl nano » nacl kno (Expandir a Pesquisa), nacl nabr (Expandir a Pesquisa), nacl naoh (Expandir a Pesquisa)
l combs » e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa), l comps (Expandir a Pesquisa)
5 metil » 5 methyl (Expandir a Pesquisa)
3 nacl » _ nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l combs john n ) OR ((( 5 metil complexes during ngoc ) OR ( 3 nacl nano carlos nunez ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l combs john n ) OR ((( 5 metil complexes during ngoc ) OR ( 3 nacl nano carlos nunez ))))*.