Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
renal research » retinal research (Expandir a Pesquisa), regional research (Expandir a Pesquisa), general 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)
systems des » systems does (Expandir a Pesquisa), systems dels (Expandir a Pesquisa), systems de (Expandir a Pesquisa)
nerve van » nerve vas (Expandir a Pesquisa), herve van (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
j letter » bj letter (Expandir a Pesquisa), cj letter (Expandir a Pesquisa), j letters (Expandir a Pesquisa)
nerve cn » nerve can (Expandir a Pesquisa), nerve c (Expandir a Pesquisa), nerve co (Expandir a Pesquisa)
van dis » van die (Expandir a Pesquisa), van diest (Expandir a Pesquisa), van dijk (Expandir a Pesquisa)
i censo » di censo (Expandir a Pesquisa), o censo (Expandir a Pesquisa), _ censo (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renata (Expandir a Pesquisa)
cn dis » en dis (Expandir a Pesquisa), nn dis (Expandir a Pesquisa), cent dis (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 van dis ) or ( i censo nerve cn dis ))) or ( j renal research systems des ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j letter nerve van dis ) OR ( i censo nerve cn dis ))) OR ( j renal research systems des )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j letter nerve van dis ) or ( i censo nerve cn dis ))) or ( j renal research systems des ))*.