Talvez deva tentar algumas variações de ortografia:
east congo » fast congo (Expandir a Pesquisa), east mongol (Expandir a Pesquisa), west congo (Expandir a Pesquisa)
nat host » bat host (Expandir a Pesquisa), rat host (Expandir a Pesquisa), nat hist (Expandir a Pesquisa)
eat host » bat host (Expandir a Pesquisa), rat host (Expandir a Pesquisa), yeast host (Expandir a Pesquisa)
congo et » congo e (Expandir a Pesquisa), congo a (Expandir a Pesquisa), congo _ (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (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 east » _ east (Expandir a Pesquisa), c east (Expandir a Pesquisa), a east (Expandir a Pesquisa)
et now » set now (Expandir a Pesquisa), et non (Expandir a Pesquisa), et nos (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j ((nat host) OR (eat host)) can now ) or ((( a nacl clamp j noh ) or ( j east congo et now ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j ((nat host) OR (eat host)) can now ) OR ((( a nacl clamp j noh ) OR ( j east congo et now )))).
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j ((nat host) OR (eat host)) can now ) or ((( a nacl clamp j noh ) or ( j east congo et now ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j ((nat host) OR (eat host)) can now ) or ((( a nacl clamp j noh ) or ( j east congo et now ))))*.