Talvez deva tentar algumas variações de ortografia:
current curve » current survey (Expandir a Pesquisa), current care (Expandir a Pesquisa), current nerve (Expandir a Pesquisa)
curve system » curve systems (Expandir a Pesquisa), nerve system (Expandir a Pesquisa), cave system (Expandir a Pesquisa)
direct nerve » direct energy (Expandir a Pesquisa), direct neural (Expandir a Pesquisa)
senal merve » senol merve (Expandir a Pesquisa), sena herve (Expandir a Pesquisa), meral merve (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
system di » system de (Expandir a Pesquisa), system d (Expandir a Pesquisa), system dias (Expandir a Pesquisa)
case disc » cause disc (Expandir a Pesquisa), case di (Expandir a Pesquisa), case dose (Expandir a Pesquisa)
can diet » can direct (Expandir a Pesquisa)
j direct » j director (Expandir a Pesquisa), nhj direct (Expandir a Pesquisa)
i senal » i sena (Expandir a Pesquisa), i segnali (Expandir a Pesquisa), i seminal (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 senal merve can diet ) OR ( i current curve system di ))) OR ( j direct nerve case disc ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i senal merve can diet ) or ( i current curve system di ))) or ( j direct nerve case disc ))*.