Talvez deva tentar algumas variações de ortografia:
research system » research systems (Expandir a Pesquisa)
ghana research » china research (Expandir a Pesquisa), grama research (Expandir a Pesquisa), pharma research (Expandir a Pesquisa)
central merve » central nerve (Expandir a Pesquisa), central nerven (Expandir a Pesquisa), central nerves (Expandir a Pesquisa)
renal nerve » retinal nerve (Expandir a Pesquisa), cranial nerve (Expandir a Pesquisa), spinal nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system dcs (Expandir a Pesquisa), system di (Expandir a Pesquisa)
j central » 1hfj central (Expandir a Pesquisa)
merve can » nerve can (Expandir a Pesquisa)
ii renal » ii retinal (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 ghana » _ ghana (Expandir a Pesquisa), j ghan (Expandir a Pesquisa), i ghana (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.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j central merve can dis ) OR ( ii renal nerve c dos ))) OR ( j ghana research system dis ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j central merve can dis ) or ( ii renal nerve c dos ))) or ( j ghana research system dis ))*.