Talvez deva tentar algumas variações de ortografia:
reserve system » research system (Expandir a Pesquisa), research systems (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
bent reserve » debt reserve (Expandir a Pesquisa), bank reserve (Expandir a Pesquisa), bat reserve (Expandir a Pesquisa)
system dias » system dan (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system dcus (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
system due » system der (Expandir a Pesquisa)
system dis » system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa), system das (Expandir a Pesquisa)
ai cent » i cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa), ai centri (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.

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