Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
medina research » media research (Expandir a Pesquisa), medica research (Expandir a Pesquisa), medical research (Expandir a Pesquisa)
dental nerve » mental nerve (Expandir a Pesquisa), ventral nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa)
systems risk » system risk (Expandir a Pesquisa), systemic risk (Expandir a Pesquisa), systems ras (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve ct (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
j medina » j mejia (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat bias (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve co (Expandir a Pesquisa), nerve ct (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: (((( a dental nerve cat dis ) OR ( i beta nerve c dis ))) OR ( j medina research systems risk ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a dental nerve cat dis ) or ( i beta nerve c dis ))) or ( j medina research systems risk ))*.