Talvez deva tentar algumas variações de ortografia:
sir complex » sirna complex (Expandir a Pesquisa), pair complex (Expandir a Pesquisa), dimer complex (Expandir a Pesquisa)
complex can » complex case (Expandir a Pesquisa), complex care (Expandir a Pesquisa), complex cell (Expandir a Pesquisa)
china new » china's new (Expandir a Pesquisa), china na (Expandir a Pesquisa)
en china » en chile (Expandir a Pesquisa)
can ngos » can ngoc (Expandir a Pesquisa), can non (Expandir a Pesquisa), can now (Expandir a Pesquisa)
cal ngos » local ngos (Expandir a Pesquisa)
neira o » neira a (Expandir a Pesquisa), neira r (Expandir a Pesquisa), neira _ (Expandir a Pesquisa)
neira m » neira a (Expandir a Pesquisa), neira r (Expandir a Pesquisa)
3 sir » _ sir (Expandir a Pesquisa), 3 sio (Expandir a Pesquisa), 3 sar (Expandir a Pesquisa)
l en » l e (Expandir a Pesquisa), l n (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 en china new ) or ((( 3 sir complex can ngos ) or ( a ((neira o) OR (neira m)) cal ngos ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l en china new ) OR ((( 3 sir complex can ngos ) OR ( a ((neira o) OR (neira m)) cal ngos )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l en china new ) or ((( 3 sir complex can ngos ) or ( a ((neira o) OR (neira m)) cal ngos ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l en china new ) or ((( 3 sir complex can ngos ) or ( a ((neira o) OR (neira m)) cal ngos ))))*.