Talvez deva tentar algumas variações de ortografia:
methyl complex » metal complex (Expandir a Pesquisa), method complex (Expandir a Pesquisa), methylase complex (Expandir a Pesquisa)
complex nguyen » complex neuquen (Expandir a Pesquisa), complex neuron (Expandir a Pesquisa), complex noun (Expandir a Pesquisa)
coombes john » coombs john (Expandir a Pesquisa), coombes jason (Expandir a Pesquisa), forbes john (Expandir a Pesquisa)
carlos nodal » carlos vidal (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos nejar (Expandir a Pesquisa)
nano carlos » cano carlos (Expandir a Pesquisa), nino carlos (Expandir a Pesquisa), nuno carlos (Expandir a Pesquisa)
nguyen nga » nguyen ngoc (Expandir a Pesquisa), nguyen nam (Expandir a Pesquisa)
k coombes » l coomber (Expandir a Pesquisa)
nacl nano » nacl kno (Expandir a Pesquisa), nacl nabr (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 k coombes john n ) OR ((( 5 methyl complex nguyen nga ) OR ( 0.9 nacl nano carlos nodal ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j k coombes john n ) OR ((( 5 methyl complex nguyen nga ) OR ( 0.9 nacl nano carlos nodal ))))*.