Talvez deva tentar algumas variações de ortografia:
unnerve system » und nervensystem (Expandir a Pesquisa), reserve system (Expandir a Pesquisa), runner system (Expandir a Pesquisa)
nervous case » nervous cases (Expandir a Pesquisa), nervous age (Expandir a Pesquisa), nervous cell (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), reserve system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
can unnerve » can nerve (Expandir a Pesquisa), can innervate (Expandir a Pesquisa), can underlie (Expandir a Pesquisa)
system due » system de (Expandir a Pesquisa), system der (Expandir a Pesquisa)
real nerve » renal nerve (Expandir a Pesquisa), reveal nerve (Expandir a Pesquisa), oral nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system di (Expandir a Pesquisa), system das (Expandir a Pesquisa)
i central » coli central (Expandir a Pesquisa), hemi central (Expandir a Pesquisa)
j real » j read (Expandir a Pesquisa)
a can » _ can (Expandir a Pesquisa), a cat (Expandir a Pesquisa), i can (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( a can unnerve system due ) or ( i central nervous case due ))) or ( j real nerve system dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a can unnerve system due ) OR ( i central nervous case due ))) OR ( j real nerve system dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a can unnerve system due ) or ( i central nervous case due ))) or ( j real nerve system dis ))*.