Talvez deva tentar algumas variações de ortografia:
benign nerve » benign nevi (Expandir a Pesquisa), benign beale (Expandir a Pesquisa), benign nevus (Expandir a Pesquisa)
center nerve » cancer nerve (Expandir a Pesquisa), center nurse (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
nerve cause » nerve caused (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve course (Expandir a Pesquisa)
benign neck » benign nevi (Expandir a Pesquisa)
neck based » neck case (Expandir a Pesquisa), rock based (Expandir a Pesquisa), neck cases (Expandir a Pesquisa)
2 center » 2 centers (Expandir a Pesquisa), _ center (Expandir a Pesquisa), a center (Expandir a Pesquisa)
nerve cn » nerve can (Expandir a Pesquisa), nerve c (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa)
1 benign » _ benign (Expandir a Pesquisa), 2 benign (Expandir a Pesquisa)
cause di » cause de (Expandir a Pesquisa), cause d (Expandir a Pesquisa), cause du (Expandir a Pesquisa)
a benign » _ benign (Expandir a Pesquisa)
based do » based doa (Expandir a Pesquisa), based dot (Expandir a Pesquisa), based dog (Expandir a Pesquisa)
cn dis » en dis (Expandir a Pesquisa), nn dis (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": "(( 2 center nerve cn dis ) OR ((( 1 benign nerve cause di ) OR ( a benign neck based do ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 2 center nerve cn dis ) OR ((( 1 benign nerve cause di ) OR ( a benign neck based do ))))*.