Talvez deva tentar algumas variações de ortografia:
phan ngoc » pham ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa)
nay clamp » dnan clamp (Expandir a Pesquisa), a clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
akt cgmp » akt camp (Expandir a Pesquisa), akt ctmp (Expandir a Pesquisa), a cgmp (Expandir a Pesquisa)
can ngoc » tran ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa)
comb van » comb jean (Expandir a Pesquisa), rob van (Expandir a Pesquisa), job van (Expandir a Pesquisa)
van ngoc » tran ngoc (Expandir a Pesquisa), vu ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
et comb » et com (Expandir a Pesquisa), et comp (Expandir a Pesquisa), et comme (Expandir a Pesquisa)
_ nay » _ nayf (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
j new » a new (Expandir a Pesquisa), _ new (Expandir a Pesquisa), 2 new (Expandir a Pesquisa)
j et » j e (Expandir a Pesquisa), j st (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: (( _ akt cgmp ((can ngoc) OR (phan ngoc)) ) or ((( _ nay clamp j new ) or ( j et comb van ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ akt cgmp ((can ngoc) OR (phan ngoc)) ) OR ((( _ nay clamp j new ) OR ( j et comb van ngoc )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( _ akt cgmp ((can ngoc) OR (phan ngoc)) ) or ((( _ nay clamp j new ) or ( j et comb van ngoc ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ akt cgmp ((can ngoc) OR (phan ngoc)) ) or ((( _ nay clamp j new ) or ( j et comb van ngoc ))))*.