Talvez deva tentar algumas variações de ortografia:
research system » research systems (Expandir a Pesquisa)
dental research » medical research (Expandir a Pesquisa)
cancer merve » cancer nerve (Expandir a Pesquisa), cancer serves (Expandir a Pesquisa), cancer merece (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
can nerse » can nurse (Expandir a Pesquisa), can nerve (Expandir a Pesquisa), can nurses (Expandir a Pesquisa)
j cancer » j canter (Expandir a Pesquisa), j cantero (Expandir a Pesquisa), j cancela (Expandir a Pesquisa)
j dental » j delta (Expandir a Pesquisa), j dent (Expandir a Pesquisa), j deal (Expandir a Pesquisa)
can dis » can disc (Expandir a Pesquisa), van dis (Expandir a Pesquisa), can die (Expandir a Pesquisa)
nerse c » nurse c (Expandir a Pesquisa), nourse c (Expandir a Pesquisa), nersey _ (Expandir a Pesquisa)
i can » _ can (Expandir a Pesquisa)
c dos » e dos (Expandir a Pesquisa), a 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 cancer merve can dis ) or ( i can nerse c dos ))) or ( j dental research system der ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j cancer merve can dis ) OR ( i can nerse c dos ))) OR ( j dental research system der )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j cancer merve can dis ) or ( i can nerse c dos ))) or ( j dental research system der ))*.