Talvez deva tentar algumas variações de ortografia:
central neural » central nepal (Expandir a Pesquisa), central neurons (Expandir a Pesquisa)
benzo nerve » bent nerve (Expandir a Pesquisa), benign nerve (Expandir a Pesquisa)
neural cat » neural cest (Expandir a Pesquisa), neural cost (Expandir a Pesquisa), neural a (Expandir a Pesquisa)
i central » coli central (Expandir a Pesquisa), hemi central (Expandir a Pesquisa)
i retinal » ii retinal (Expandir a Pesquisa), hi retinal (Expandir a Pesquisa), iv retinal (Expandir a Pesquisa)
nerve can » merve can (Expandir a Pesquisa), nerve cn (Expandir a Pesquisa), nerve canal (Expandir a Pesquisa)
nerve cat » nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa), nerve c (Expandir a Pesquisa)
cat dis » cat diets (Expandir a Pesquisa), cat diet (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (Expandir a Pesquisa)
j benzo » j bento (Expandir a Pesquisa), j benito (Expandir a Pesquisa), j benton (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 neural cat dis ) OR ( i retinal nerve can dcs ))) OR ( j benzo nerve cat dis ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i central neural cat dis ) OR ( i retinal nerve can dcs ))) OR ( j benzo nerve cat dis ))*.