Talvez deva tentar algumas variações de ortografia:
east congo » fast congo (Expandir a Pesquisa), east mongol (Expandir a Pesquisa), west congo (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
congo tu » congo au (Expandir a Pesquisa), congo du (Expandir a Pesquisa), congo tak (Expandir a Pesquisa)
rat amp » rat ampa (Expandir a Pesquisa), fat amp (Expandir a Pesquisa), rat amd (Expandir a Pesquisa)
mat amp » mat amin (Expandir a Pesquisa), mat arip (Expandir a Pesquisa)
a clamp » c clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa), a claims (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
tu ngoc » thu ngoc (Expandir a Pesquisa), vu ngoc (Expandir a Pesquisa), ta ngoc (Expandir a Pesquisa)
j east » e east (Expandir a Pesquisa), c east (Expandir a Pesquisa), a east (Expandir a Pesquisa)
j non » _ non (Expandir a Pesquisa), a non (Expandir a Pesquisa), i non (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: (( _ ((rat amp) OR (mat amp)) can ngoc ) or ((( j a clamp j non ) or ( j east congo tu ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ ((rat amp) OR (mat amp)) can ngoc ) OR ((( j a clamp j non ) OR ( j east congo tu ngoc )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( _ ((rat amp) OR (mat amp)) can ngoc ) or ((( j a clamp j non ) or ( j east congo tu ngoc ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ ((rat amp) OR (mat amp)) can ngoc ) or ((( j a clamp j non ) or ( j east congo tu ngoc ))))*.