Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex tien » complex times (Expandir a Pesquisa), complex than (Expandir a Pesquisa), complex time (Expandir a Pesquisa)
carlos novo » carlos nino (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos neto (Expandir a Pesquisa)
can carlos » cano carlos (Expandir a Pesquisa), chan carlos (Expandir a Pesquisa), san carlos (Expandir a Pesquisa)
e coombs » de coombs (Expandir a Pesquisa), e coombes (Expandir a Pesquisa), g coombs (Expandir a Pesquisa)
john net » john new (Expandir a Pesquisa), john neetu (Expandir a Pesquisa), john asnet (Expandir a Pesquisa)
5 metal » 5 methyl (Expandir a Pesquisa)
tien ng » tien ngo (Expandir a Pesquisa), tien n (Expandir a Pesquisa), tien ni (Expandir a Pesquisa)
3.5 nac » 3.5 nacl (Expandir a Pesquisa), 7.5 nacl (Expandir a Pesquisa)
nac can » ac can (Expandir a Pesquisa), dac can (Expandir a Pesquisa), mac can (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 e coombs john net ) OR ((( 5 metal complex tien ng ) OR ( 3.5 nac can carlos novo ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j e coombs john net ) OR ((( 5 metal complex tien ng ) OR ( 3.5 nac can carlos novo ))))*.