Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
dent research » dental research (Expandir a Pesquisa), rodent research (Expandir a Pesquisa), event research (Expandir a Pesquisa)
entner nerve » enteric nerve (Expandir a Pesquisa), after nerve (Expandir a Pesquisa), other nerve (Expandir a Pesquisa)
benth nerve » bent nerve (Expandir a Pesquisa), both nerve (Expandir a Pesquisa), seventh nerve (Expandir a Pesquisa)
systems di » systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa), systems d (Expandir a Pesquisa)
nerve cn » nerve can (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
i benth » l benth (Expandir a Pesquisa), ex benth (Expandir a Pesquisa)
nerve c » nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa), nerve can (Expandir a Pesquisa)
cn dcs » can dcs (Expandir a Pesquisa)
j dent » j deng (Expandir a Pesquisa)
c dis » c dias (Expandir a Pesquisa), c disc (Expandir a Pesquisa), c dos (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 cn dcs ) OR ( i benth nerve c dis ))) OR ( j dent research systems di ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( _ entner nerve cn dcs ) or ( i benth nerve c dis ))) or ( j dent research systems di ))*.