Talvez deva tentar algumas variações de ortografia:
congo care » congo case (Expandir a Pesquisa), congo cas (Expandir a Pesquisa), congo art (Expandir a Pesquisa)
fast congo » west congo (Expandir a Pesquisa), fast control (Expandir a Pesquisa), fast contour (Expandir a Pesquisa)
nat hist » inst hist (Expandir a Pesquisa), a hist (Expandir a Pesquisa), nat hiv (Expandir a Pesquisa)
hist can » host can (Expandir a Pesquisa), list can (Expandir a Pesquisa), xist can (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
care now » care new (Expandir a Pesquisa), care non (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
a nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
j fast » j faust (Expandir a Pesquisa), j fausto (Expandir a Pesquisa)
e nat » e nata (Expandir a Pesquisa), e nao (Expandir a Pesquisa), e nas (Expandir a Pesquisa)
j noh » _ noh (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se retirar as aspas poderá fazer uma pesquisa mais abragente: (( e nat hist can ngoc ) OR ((( a nacl clamp j noh ) OR ( j fast congo care now )))).