Talvez deva tentar algumas variações de ortografia:
nacl impaired » al impaired (Expandir a Pesquisa), renal impaired (Expandir a Pesquisa), focal impaired (Expandir a Pesquisa)
impaired von » impaired v (Expandir a Pesquisa), impaired vision (Expandir a Pesquisa), impaired virion (Expandir a Pesquisa)
campos care » campos carl (Expandir a Pesquisa), campos caro (Expandir a Pesquisa), campos carmen (Expandir a Pesquisa)
natl clamp » tail clamp (Expandir a Pesquisa)
care ngoc » karen ngoc (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa), cao ngoc (Expandir a Pesquisa)
von ngoc » van ngoc (Expandir a Pesquisa), vo ngoc (Expandir a Pesquisa), son ngoc (Expandir a Pesquisa)
y campos » y campo (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
a nacl » _ nacl (Expandir a Pesquisa), m nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (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.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( a nacl impaired von ngoc ) OR ((( j natl clamp a now ) OR ( j y campos care ngoc ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( a nacl impaired von ngoc ) OR ((( j natl clamp a now ) OR ( j y campos care ngoc ))))*.