Talvez deva tentar algumas variações de ortografia:
ventral nerve » femoral nerve (Expandir a Pesquisa)
nerve system » nervous system (Expandir a Pesquisa), drive system (Expandir a Pesquisa)
absent nerve » bent nerve (Expandir a Pesquisa), abducent nerve (Expandir a Pesquisa), augment nerve (Expandir a Pesquisa)
crest nerve » treat nerve (Expandir a Pesquisa), crest derived (Expandir a Pesquisa), current nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
nerve cyst » nerve cat (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
1 ventral » a ventral (Expandir a Pesquisa), 2 ventral (Expandir a Pesquisa), da1 ventral (Expandir a Pesquisa)
l absent » _ absent (Expandir a Pesquisa), 17 absent (Expandir a Pesquisa), c1 absent (Expandir a Pesquisa)
_ crest » _ create (Expandir a Pesquisa), _ credit (Expandir a Pesquisa)
case d » case de (Expandir a Pesquisa), case 2 (Expandir a Pesquisa), case 1 (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: (((( 1 ventral nerve system dis ) or ( _ crest nerve cyst due ))) or ( l absent nerve case d ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 1 ventral nerve system dis ) OR ( _ crest nerve cyst due ))) OR ( l absent nerve case d )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 1 ventral nerve system dis ) or ( _ crest nerve cyst due ))) or ( l absent nerve case d ))*.