Talvez deva tentar algumas variações de ortografia:
impaired rank » impaired ran (Expandir a Pesquisa), impaired rats (Expandir a Pesquisa), impaired rna (Expandir a Pesquisa)
nac impaired » sac impaired (Expandir a Pesquisa), can impaired (Expandir a Pesquisa), a impaired (Expandir a Pesquisa)
dnab clamp » dna clamp (Expandir a Pesquisa), dnan clamp (Expandir a Pesquisa), dna clamps (Expandir a Pesquisa)
chimo can » chimp can (Expandir a Pesquisa), chimo en (Expandir a Pesquisa), chimo a (Expandir a Pesquisa)
rank ngo » bank ngos (Expandir a Pesquisa), rank g (Expandir a Pesquisa), rank n (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
y chimo » y chino (Expandir a Pesquisa), y chiao (Expandir a Pesquisa), y chimu (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
a dnab » _ dnab (Expandir a Pesquisa), a dnaj (Expandir a Pesquisa)
j nac » _ nac (Expandir a Pesquisa), a nac (Expandir a Pesquisa), α nac (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": "(( j nac impaired rank ngo ) OR ((( a dnab clamp a now ) OR ( j y chimo can now ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j nac impaired rank ngo ) OR ((( a dnab clamp a now ) OR ( j y chimo can now ))))*.