Talvez deva tentar algumas variações de ortografia:
threat severe » treat severe (Expandir a Pesquisa), three severe (Expandir a Pesquisa), threat levers (Expandir a Pesquisa)
center nerve » cancer nerve (Expandir a Pesquisa), center nurse (Expandir a Pesquisa), letter nerve (Expandir a Pesquisa)
detect nerve » direct nerve (Expandir a Pesquisa), detect neural (Expandir a Pesquisa), detect novel (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
severe cyst » severe cast (Expandir a Pesquisa), severe cystic (Expandir a Pesquisa), severe chest (Expandir a Pesquisa)
nerve cyst » nerve case (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
j threat » _ threat (Expandir a Pesquisa), a threat (Expandir a Pesquisa), 2 threat (Expandir a Pesquisa)
cyst dis » cyst d (Expandir a Pesquisa)
j detect » je detect (Expandir a Pesquisa), _ detect (Expandir a Pesquisa), 2 detect (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 center nerve cyst due ) or ( j threat severe cyst dis ))) or ( j detect nerve system dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j center nerve cyst due ) OR ( j threat severe cyst dis ))) OR ( j detect nerve system dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center nerve cyst due ) or ( j threat severe cyst dis ))) or ( j detect nerve system dis ))*.