Talvez deva tentar algumas variações de ortografia:
cat ngoc » cam ngoc (Expandir a Pesquisa), chau ngoc (Expandir a Pesquisa), hoat ngoc (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa)
cao ngoc » bao ngoc (Expandir a Pesquisa), ha ngoc (Expandir a Pesquisa), van ngoc (Expandir a Pesquisa)
amp can » amp camp (Expandir a Pesquisa)
j nail » _ nail (Expandir a Pesquisa), a nail (Expandir a Pesquisa), 3 nail (Expandir a Pesquisa)
nail a » nail _ (Expandir a Pesquisa)
nacl e » nacl en (Expandir a Pesquisa), nacl _ (Expandir a Pesquisa), nacl a (Expandir a Pesquisa)
i amp » _ amp (Expandir a Pesquisa), 5 amp (Expandir a Pesquisa), r amp (Expandir a Pesquisa)
e cao » _ cao (Expandir a Pesquisa), y cao (Expandir a Pesquisa), o cao (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 i amp can near ) or ((( j nail a ((cat ngoc) OR (can ngoc)) ) or ( 3.5 nacl e cao ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j i amp can near ) OR ((( j nail a ((cat ngoc) OR (can ngoc)) ) OR ( 3.5 nacl e cao ngoc )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j i amp can near ) or ((( j nail a ((cat ngoc) OR (can ngoc)) ) or ( 3.5 nacl e cao ngoc ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j i amp can near ) or ((( j nail a ((cat ngoc) OR (can ngoc)) ) or ( 3.5 nacl e cao ngoc ))))*.