Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
renal research » retinal research (Expandir a Pesquisa), dental research (Expandir a Pesquisa), regional research (Expandir a Pesquisa)
cancer serves » cancer series (Expandir a Pesquisa), cancer services (Expandir a Pesquisa), cancer surveys (Expandir a Pesquisa)
systems dis » systems disk (Expandir a Pesquisa), systems tdis (Expandir a Pesquisa), systems dss (Expandir a Pesquisa)
serves van » servaas van (Expandir a Pesquisa), serves a (Expandir a Pesquisa), eves van (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
j cancer » j canter (Expandir a Pesquisa), j cantero (Expandir a Pesquisa), j candel (Expandir a Pesquisa)
van dis » van die (Expandir a Pesquisa), van diest (Expandir a Pesquisa), van dijk (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (Expandir a Pesquisa)
i bent » i benth (Expandir a Pesquisa), i benet (Expandir a Pesquisa), i bento (Expandir a Pesquisa)
a dis » a dos (Expandir a Pesquisa), a des (Expandir a Pesquisa), a dia (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: (((( j cancer serves van dis ) OR ( i bent nerve a dis ))) OR ( j renal research systems dis ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j cancer serves van dis ) or ( i bent nerve a dis ))) or ( j renal research systems dis ))*.