Talvez deva tentar algumas variações de ortografia:
complex thien » complex thin (Expandir a Pesquisa), complex than (Expandir a Pesquisa), complex three (Expandir a Pesquisa)
metal complex » metal complexes (Expandir a Pesquisa)
jair carlos » mir carlos (Expandir a Pesquisa), nejar carlos (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa), hobbs john (Expandir a Pesquisa)
thien ngoc » tien ngoc (Expandir a Pesquisa), thi ngoc (Expandir a Pesquisa), tuyen ngoc (Expandir a Pesquisa)
nacl jair » nacl nabr (Expandir a Pesquisa)
john net » john new (Expandir a Pesquisa), john neetu (Expandir a Pesquisa), john asnet (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa)
5 metal » 5 methyl (Expandir a Pesquisa)
negrao » negras (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 thien ngoc ) or ( 3.5 nacl jair carlos negrao ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs john net ) OR ((( 5 metal complex thien ngoc ) OR ( 3.5 nacl jair carlos negrao )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs john net ) or ((( 5 metal complex thien ngoc ) or ( 3.5 nacl jair carlos negrao ))))*.