Talvez deva tentar algumas variações de ortografia:
mental research » dental research (Expandir a Pesquisa), central research (Expandir a Pesquisa), neonatal research (Expandir a Pesquisa)
research system » research systems (Expandir a Pesquisa)
cancer merece » cancer m.r.c (Expandir a Pesquisa), cancer march (Expandir a Pesquisa), cancer marine (Expandir a Pesquisa)
merece can » merece a (Expandir a Pesquisa), merece la (Expandir a Pesquisa), merve can (Expandir a Pesquisa)
system dan » system data (Expandir a Pesquisa), system dias (Expandir a Pesquisa), system der (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 candel (Expandir a Pesquisa)
j mental » j mengual (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j mehta (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)
_ can » _ cat (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 cancer merece can dis ) or ( _ can nerse c dis ))) or ( j mental research system dan ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j cancer merece can dis ) OR ( _ can nerse c dis ))) OR ( j mental research system dan )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j cancer merece can dis ) or ( _ can nerse c dis ))) or ( j mental research system dan ))*.