Talvez deva tentar algumas variações de ortografia:
research system » research systems (Expandir a Pesquisa)
centner nerve » central nerve (Expandir a Pesquisa), cancer nerve (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
lung research » aging research (Expandir a Pesquisa), doing research (Expandir a Pesquisa)
j centner » j center (Expandir a Pesquisa), m centner (Expandir a Pesquisa), _ entner (Expandir a Pesquisa)
nerve can » nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
system de » system der (Expandir a Pesquisa), system delay (Expandir a Pesquisa)
can disc » can dinc (Expandir a Pesquisa), chain disc (Expandir a Pesquisa), can diet (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
c dias » c diaz (Expandir a Pesquisa)
j lung » j luna (Expandir a Pesquisa), j lunt (Expandir a Pesquisa), 1 lung (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 centner nerve can disc ) OR ( ii retinal nerve c dias ))) OR ( j lung research system de ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j centner nerve can disc ) OR ( ii retinal nerve c dias ))) OR ( j lung research system de ))*.