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), case system (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
bet drive » belt drive (Expandir a Pesquisa), bet driven (Expandir a Pesquisa), met drive (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve ct (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat bias (Expandir a Pesquisa)
j bent » j benet (Expandir a Pesquisa), j bento (Expandir a Pesquisa), j bena (Expandir a Pesquisa)
j bet » j beth (Expandir a Pesquisa), j beta (Expandir a Pesquisa), j bett (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: (((( j bet drive system design ) or ( j center pulse system design ))) or ( j bent nerve cat dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j bet drive system design ) OR ( j center pulse system design ))) OR ( j bent nerve cat dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j bet drive system design ) or ( j center pulse system design ))) or ( j bent nerve cat dis ))*.