Talvez deva tentar algumas variações de ortografia:
can ngoc » tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
clamp ar » clamp a (Expandir a Pesquisa), clamp _ (Expandir a Pesquisa), clamp j (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)
ac camp » a camp (Expandir a Pesquisa), c camp (Expandir a Pesquisa), amp camp (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa)
c clamp » _ clamp (Expandir a Pesquisa)
rd cong » rd congo (Expandir a Pesquisa), d cong (Expandir a Pesquisa)
ar nos » mar nos (Expandir a Pesquisa), par nos (Expandir a Pesquisa), pr nos (Expandir a Pesquisa)
j ac » j a (Expandir a Pesquisa), j al (Expandir a Pesquisa), j am (Expandir a Pesquisa)
j rd » j ord (Expandir a Pesquisa), j r (Expandir a Pesquisa), j d (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 ac camp ((can now) OR (can ngoc)) ) or ((( j c clamp ar nos ) or ( j rd cong van ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j ac camp ((can now) OR (can ngoc)) ) OR ((( j c clamp ar nos ) OR ( j rd cong van ngoc ))))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j ac camp ((can now) OR (can ngoc)) ) or ((( j c clamp ar nos ) or ( j rd cong van ngoc ))))*".