Talvez deva tentar algumas variações de ortografia:
absent nerve » abducent nerve (Expandir a Pesquisa), augment nerve (Expandir a Pesquisa), absent native (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
spinal merve » spinal nerve (Expandir a Pesquisa), spinal nerves (Expandir a Pesquisa), espinal nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
bent nerve » mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa), benign nerve (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
i absent » ii absent (Expandir a Pesquisa), _ absent (Expandir a Pesquisa), l absent (Expandir a Pesquisa)
i spinal » i spiral (Expandir a Pesquisa), iii spinal (Expandir a Pesquisa), c2 spinal (Expandir a Pesquisa)
can dcs » can tdcs (Expandir a Pesquisa), can dce (Expandir a Pesquisa), can dags (Expandir a Pesquisa)
j bent » j benet (Expandir a Pesquisa), j bento (Expandir a Pesquisa), j bena (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 absent nerve system dis ) OR ( i spinal merve can dcs ))) OR ( j bent nerve system dis ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i absent nerve system dis ) OR ( i spinal merve can dcs ))) OR ( j bent nerve system dis ))*.