Talvez deva tentar algumas variações de ortografia:
phan ngoc » pham ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa)
dan ning » yan ning (Expandir a Pesquisa), han ning (Expandir a Pesquisa), pan ning (Expandir a Pesquisa)
tan ning » tang ning (Expandir a Pesquisa), yan ning (Expandir a Pesquisa), han ning (Expandir a Pesquisa)
lamp pcr » clamp pcr (Expandir a Pesquisa), amp pcr (Expandir a Pesquisa), lamp 2c (Expandir a Pesquisa)
com phan » kim phan (Expandir a Pesquisa), com php (Expandir a Pesquisa), m phan (Expandir a Pesquisa)
2a lamp » a lamp (Expandir a Pesquisa), 2 lamp (Expandir a Pesquisa), cap lamp (Expandir a Pesquisa)
pcr ngs » dpcr ngs (Expandir a Pesquisa)
et com » et comb (Expandir a Pesquisa), et comp (Expandir a Pesquisa), et col (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (Expandir a Pesquisa)
j 2a » j a (Expandir a Pesquisa), j da (Expandir a Pesquisa), j 2 (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: (( j nat chimp ((dan ning) OR (tan ning)) ) or ((( j 2a lamp pcr ngs ) or ( j et com phan ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j nat chimp ((dan ning) OR (tan ning)) ) OR ((( j 2a lamp pcr ngs ) OR ( j et com phan ngoc )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j nat chimp ((dan ning) OR (tan ning)) ) or ((( j 2a lamp pcr ngs ) or ( j et com phan ngoc ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j nat chimp ((dan ning) OR (tan ning)) ) or ((( j 2a lamp pcr ngs ) or ( j et com phan ngoc ))))*.