Talvez deva tentar algumas variações de ortografia:
phan ngoc » pham ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa)
nat comp » et comp (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
lon phan » long phan (Expandir a Pesquisa), loan phan (Expandir a Pesquisa), son phan (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
j nail » _ nail (Expandir a Pesquisa), 3 nail (Expandir a Pesquisa), 5 nail (Expandir a Pesquisa)
a ngoc » ha ngoc (Expandir a Pesquisa), ta ngoc (Expandir a Pesquisa), la ngoc (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (Expandir a Pesquisa)
e lon » e long (Expandir a Pesquisa), e lona (Expandir a Pesquisa), _ lon (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j nat comp can ngoc ) OR ((( ((j nail) OR (a nail)) clamp a ngoc ) OR ( j e lon phan ngoc ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j nat comp can ngoc ) or ((( ((j nail) OR (a nail)) clamp a ngoc ) or ( j e lon phan ngoc ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j nat comp can ngoc ) or ((( ((j nail) OR (a nail)) clamp a ngoc ) or ( j e lon phan ngoc ))))*.