Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex metal » complex mental (Expandir a Pesquisa), complex metallic (Expandir a Pesquisa), complex medical (Expandir a Pesquisa)
abrao carlos » cabral carlos (Expandir a Pesquisa), abreu carlos (Expandir a Pesquisa), abril carlos (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa), hobbs john (Expandir a Pesquisa)
carlos naa » carlos nava (Expandir a Pesquisa), carlos nara (Expandir a Pesquisa), carlos noa (Expandir a Pesquisa)
john need » john reed (Expandir a Pesquisa), john neena (Expandir a Pesquisa), john neetu (Expandir a Pesquisa)
metal nox » metal n (Expandir a Pesquisa), metal ni (Expandir a Pesquisa), metal n4 (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (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 _ combs john need ) or ((( 5 metal complex metal nox ) or ( 7.5 nacl abrao carlos naa ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs john need ) OR ((( 5 metal complex metal nox ) OR ( 7.5 nacl abrao carlos naa )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs john need ) or ((( 5 metal complex metal nox ) or ( 7.5 nacl abrao carlos naa ))))*.