Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex tran » complex trans (Expandir a Pesquisa), complex tehran (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
marco carlos » marcio carlos (Expandir a Pesquisa), mario carlos (Expandir a Pesquisa), marco carlo (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), combes john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa)
null marco » krull marco (Expandir a Pesquisa)
34.5 null » 3.2 null (Expandir a Pesquisa), 4.2 null (Expandir a Pesquisa), icp34.5 null (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)
ngoc » ngo (Expandir a Pesquisa)
julio » julia (Expandir a Pesquisa), julie (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 net ) or ((( 5 metal complex tran ngoc ) or ( 34.5 null marco carlos julio ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs john net ) OR ((( 5 metal complex tran ngoc ) OR ( 34.5 null marco carlos julio )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs john net ) or ((( 5 metal complex tran ngoc ) or ( 34.5 null marco carlos julio ))))*.