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)
letter nerve » letter nurse (Expandir a Pesquisa), matter nerve (Expandir a Pesquisa), letter nervous (Expandir a Pesquisa)
censo nerve » sensory nerve (Expandir a Pesquisa)
nerve can » nerve canal (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
systems d » systems do (Expandir a Pesquisa), systems de (Expandir a Pesquisa), systems dc (Expandir a Pesquisa)
j letter » bj letter (Expandir a Pesquisa), cj letter (Expandir a Pesquisa), j letters (Expandir a Pesquisa)
can dis » can disc (Expandir a Pesquisa), van dis (Expandir a Pesquisa), can die (Expandir a Pesquisa)
i censo » o censo (Expandir a Pesquisa), _ censo (Expandir a Pesquisa), do censo (Expandir a Pesquisa)
nerve c » nerve cn (Expandir a Pesquisa), nerve _ (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (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 letter nerve can dis ) or ( i censo nerve c dis ))) or ( j renal research systems d ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j letter nerve can dis ) OR ( i censo nerve c dis ))) OR ( j renal research systems d )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j letter nerve can dis ) or ( i censo nerve c dis ))) or ( j renal research systems d ))*.