Talvez deva tentar algumas variações de ortografia:
central river » central driver (Expandir a Pesquisa), central drive (Expandir a Pesquisa), central fever (Expandir a Pesquisa)
spinal nerve » retinal nerve (Expandir a Pesquisa)
detect nerve » direct nerve (Expandir a Pesquisa), detect neural (Expandir a Pesquisa), detect novel (Expandir a Pesquisa)
system due » system der (Expandir a Pesquisa)
nerve cyst » nerve case (Expandir a Pesquisa), nerve system (Expandir a Pesquisa)
i central » coli central (Expandir a Pesquisa), hemi central (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
i spinal » _ spinal (Expandir a Pesquisa), a spinal (Expandir a Pesquisa), i spiral (Expandir a Pesquisa)
cyst dis » cyst due (Expandir a Pesquisa), cyst d (Expandir a Pesquisa)
j detect » je detect (Expandir a Pesquisa), _ detect (Expandir a Pesquisa), 2 detect (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat diet (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": "(((( i central river system due ) OR ( i spinal nerve cyst dis ))) OR ( j detect nerve cat dis ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i central river system due ) OR ( i spinal nerve cyst dis ))) OR ( j detect nerve cat dis ))*.