Talvez deva tentar algumas variações de ortografia:
current surgery » recurrent surgery (Expandir a Pesquisa), urgent surgery (Expandir a Pesquisa), current survey (Expandir a Pesquisa)
surgery system » surgery systematic (Expandir a Pesquisa)
belval nerve » renal nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
nerve can » nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
can diets » cane diets (Expandir a Pesquisa), can diet (Expandir a Pesquisa), corn diets (Expandir a Pesquisa)
system de » system der (Expandir a Pesquisa), system delay (Expandir a Pesquisa)
nerve age » nerve agent (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve area (Expandir a Pesquisa)
j belval » j bell (Expandir a Pesquisa), j bela (Expandir a Pesquisa)
age disc » aged disc (Expandir a Pesquisa), large disc (Expandir a Pesquisa), age discus (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( i cent nerve can diets ) OR ( i current surgery system de ))) OR ( j belval nerve age disc ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i cent nerve can diets ) or ( i current surgery system de ))) or ( j belval nerve age disc ))*.