Talvez deva tentar algumas variações de ortografia:
center pulse » counter pulse (Expandir a Pesquisa), center phase (Expandir a Pesquisa), inter pulse (Expandir a Pesquisa)
pulse system » base system (Expandir a Pesquisa), mouse system (Expandir a Pesquisa), case system (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
dental nerve » mental nerve (Expandir a Pesquisa), ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa)
system due » system der (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
2 center » 2 centers (Expandir a Pesquisa), _ center (Expandir a Pesquisa), a center (Expandir a Pesquisa)
j dental » j delta (Expandir a Pesquisa), j dent (Expandir a Pesquisa), j deal (Expandir a Pesquisa)
a cent » a cena (Expandir a Pesquisa), a cenp (Expandir a Pesquisa), a center (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: (((( 2 center pulse system due ) or ( a cent nerve system dis ))) or ( j dental nerve system dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 2 center pulse system due ) OR ( a cent nerve system dis ))) OR ( j dental nerve system dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 2 center pulse system due ) or ( a cent nerve system dis ))) or ( j dental nerve system dis ))*.