Talvez deva tentar algumas variações de ortografia:
medical referees » medical degrees (Expandir a Pesquisa), medical records (Expandir a Pesquisa), medical reform (Expandir a Pesquisa)
referees system » referee system (Expandir a Pesquisa), reference system (Expandir a Pesquisa), preferred system (Expandir a Pesquisa)
centeno leyva » centeno leija (Expandir a Pesquisa), benigno leyva (Expandir a Pesquisa), montano leyva (Expandir a Pesquisa)
cancer herve » cancer here (Expandir a Pesquisa), cancer nerve (Expandir a Pesquisa), cancer serves (Expandir a Pesquisa)
herve van » herve jean (Expandir a Pesquisa), herve a (Expandir a Pesquisa), herve v (Expandir a Pesquisa)
i centeno » a centeno (Expandir a Pesquisa), d centeno (Expandir a Pesquisa), j centeno (Expandir a Pesquisa)
j medical » j medina (Expandir a Pesquisa)
system di » system de (Expandir a Pesquisa), system d (Expandir a Pesquisa), system dias (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)
leyva c » leyva a (Expandir a Pesquisa), leyva f (Expandir a Pesquisa), leyva j (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 herve van dis ) or ( i centeno leyva c dis ))) or ( j medical referees system di ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j cancer herve van dis ) OR ( i centeno leyva c dis ))) OR ( j medical referees system di )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j cancer herve van dis ) or ( i centeno leyva c dis ))) or ( j medical referees system di ))*.