Talvez deva tentar algumas variações de ortografia:
recurrent nerve » recurrent neural (Expandir a Pesquisa)
direct neural » direct neuronal (Expandir a Pesquisa), direct peroral (Expandir a Pesquisa), direct oral (Expandir a Pesquisa)
neural phase » neural plate (Expandir a Pesquisa), mineral phase (Expandir a Pesquisa), spiral phase (Expandir a Pesquisa)
1 recurrent » _ recurrent (Expandir a Pesquisa), a recurrent (Expandir a Pesquisa)
use direct » used direct (Expandir a Pesquisa), use indirect (Expandir a Pesquisa), cause direct (Expandir a Pesquisa)
nerve pen » nerve pet (Expandir a Pesquisa), nerve aen (Expandir a Pesquisa), nerve pain (Expandir a Pesquisa)
phase dis » phase diets (Expandir a Pesquisa), phase does (Expandir a Pesquisa), phase dose (Expandir a Pesquisa)
pen due » en due (Expandir a Pesquisa), men due (Expandir a Pesquisa), pen dye (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 1 recurrent nerve pen due ) OR ( use direct neural phase dis ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 1 recurrent nerve pen due ) or ( use direct neural phase dis ))*.