Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
central research » dental research (Expandir a Pesquisa), general research (Expandir a Pesquisa), centred research (Expandir a Pesquisa)
entner nerve » enteric nerve (Expandir a Pesquisa), after nerve (Expandir a Pesquisa), other nerve (Expandir a Pesquisa)
nerve cann » nerve cannot (Expandir a Pesquisa), nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
systems di » systems doi (Expandir a Pesquisa), systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa)
nerve can » nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
j central » 1hfj central (Expandir a Pesquisa)
cann dcs » can dcs (Expandir a Pesquisa), cann d (Expandir a Pesquisa), cann c (Expandir a Pesquisa)
can dis » can disc (Expandir a Pesquisa), van dis (Expandir a Pesquisa), can die (Expandir a Pesquisa)
i bent » i benth (Expandir a Pesquisa), i benet (Expandir a Pesquisa), i bento (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: (((( _ entner nerve cann dcs ) OR ( i bent nerve can dis ))) OR ( j central research systems di ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( _ entner nerve cann dcs ) or ( i bent nerve can dis ))) or ( j central research systems di ))*.