Talvez deva tentar algumas variações de ortografia:
viet cong » viet cuong (Expandir a Pesquisa), viet long (Expandir a Pesquisa), viet hoang (Expandir a Pesquisa)
cong van » cuong van (Expandir a Pesquisa), jong van (Expandir a Pesquisa), tong van (Expandir a Pesquisa)
van ngoc » tran ngoc (Expandir a Pesquisa), vu ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
nat amp » mat amp (Expandir a Pesquisa), fat amp (Expandir a Pesquisa), rat amp (Expandir a Pesquisa)
amp cam » amp camp (Expandir a Pesquisa), amp can (Expandir a Pesquisa), amp ca (Expandir a Pesquisa)
a clamp » _ clamp (Expandir a Pesquisa), c clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
j viet » a viet (Expandir a Pesquisa), j vicent (Expandir a Pesquisa)
cam _ » com _ (Expandir a Pesquisa), sam _ (Expandir a Pesquisa), lam _ (Expandir a Pesquisa)
a non » _ non (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: (( _ nat amp cam _ ) or ((( j a clamp a non ) or ( j viet cong van ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ nat amp cam _ ) OR ((( j a clamp a non ) OR ( j viet cong van ngoc )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ nat amp cam _ ) or ((( j a clamp a non ) or ( j viet cong van ngoc ))))*.