Talvez deva tentar algumas variações de ortografia:
research system » research systems (Expandir a Pesquisa)
renal research » retinal research (Expandir a Pesquisa), dental research (Expandir a Pesquisa), legal research (Expandir a Pesquisa)
central nerve » ventral nerve (Expandir a Pesquisa), central nervous (Expandir a Pesquisa), central neural (Expandir a Pesquisa)
center nurses » cancer nurses (Expandir a Pesquisa), better nurses (Expandir a Pesquisa), mental nurses (Expandir a Pesquisa)
nurses can » nurses a (Expandir a Pesquisa), nurses caring (Expandir a Pesquisa)
i central » coli central (Expandir a Pesquisa)
system di » system de (Expandir a Pesquisa), system d (Expandir a Pesquisa), system dias (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
can dis » can disc (Expandir a Pesquisa), van dis (Expandir a Pesquisa), can die (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( j center nurses can dis ) or ( i central nerve c dis ))) or ( j renal research system di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j center nurses can dis ) OR ( i central nerve c dis ))) OR ( j renal research system di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j center nurses can dis ) or ( i central nerve c dis ))) or ( j renal research system di ))*.