Talvez deva tentar algumas variações de ortografia:
direct neural » direct neuronal (Expandir a Pesquisa), direct peroral (Expandir a Pesquisa), direct oral (Expandir a Pesquisa)
neural causes » natural causes (Expandir a Pesquisa), neural changes (Expandir a Pesquisa), neurons causes (Expandir a Pesquisa)
currie curve » current curve (Expandir a Pesquisa), currie carol (Expandir a Pesquisa), currie marie (Expandir a Pesquisa)
causes goes » causes does (Expandir a Pesquisa), causes ses (Expandir a Pesquisa), causes losses (Expandir a Pesquisa)
curve cost » curve cross (Expandir a Pesquisa), curve ghost (Expandir a Pesquisa), curvo costa (Expandir a Pesquisa)
je direct » de direct (Expandir a Pesquisa), e direct (Expandir a Pesquisa), 3e direct (Expandir a Pesquisa)
j currie » r currie (Expandir a Pesquisa), j curtis (Expandir a Pesquisa), j curve (Expandir a Pesquisa)
cost due » costs due (Expandir a Pesquisa), lost due (Expandir a Pesquisa), cyst due (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j currie curve cost due ) OR ( je direct neural causes goes ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j currie curve cost due ) OR ( je direct neural causes goes ))*.