Talvez deva tentar algumas variações de ortografia:
phan ngoc » pham ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa)
comb phan » comb jean (Expandir a Pesquisa), comb thin (Expandir a Pesquisa)
nay comp » nancy comp (Expandir a Pesquisa), mary comp (Expandir a Pesquisa), y comp (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
3 nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa)
e comb » e combs (Expandir a Pesquisa), e combu (Expandir a Pesquisa), e como (Expandir a Pesquisa)
j nay » j nagy (Expandir a Pesquisa), _ nay (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), _ now (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 nay comp ((can now) OR (can ngoc)) ) or ((( 3 nacl clamp a now ) or ( j e comb phan ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j nay comp ((can now) OR (can ngoc)) ) OR ((( 3 nacl clamp a now ) OR ( j e comb phan ngoc ))))*.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j nay comp ((can now) OR (can ngoc)) ) or ((( 3 nacl clamp a now ) or ( j e comb phan ngoc ))))*".