Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex tran » complex trans (Expandir a Pesquisa), complex than (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
charles nova » charles nora (Expandir a Pesquisa), charles norval (Expandir a Pesquisa), charles novaes (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa), hobbs john (Expandir a Pesquisa)
john new » john agnew (Expandir a Pesquisa), john neil (Expandir a Pesquisa), john n (Expandir a Pesquisa)
0.9 natl » 0.9 nacl (Expandir a Pesquisa)
l combs » e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa), l comps (Expandir a Pesquisa)
5 metal » 5 metil (Expandir a Pesquisa), 5 methyl (Expandir a Pesquisa)
natl jr » cinatl jr (Expandir a Pesquisa), nadol jr (Expandir a Pesquisa), patel jr (Expandir a Pesquisa)
ngoc » ngo (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 l combs john new ) or ((( 5 metal complex tran ngoc ) or ( 0.9 natl jr charles nova ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l combs john new ) OR ((( 5 metal complex tran ngoc ) OR ( 0.9 natl jr charles nova )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l combs john new ) or ((( 5 metal complex tran ngoc ) or ( 0.9 natl jr charles nova ))))*.