Talvez deva tentar algumas variações de ortografia:
research systems » research synthesis (Expandir a Pesquisa)
central nerve » ventral nerve (Expandir a Pesquisa), central nervous (Expandir a Pesquisa), central neural (Expandir a Pesquisa)
meta research » a research (Expandir a Pesquisa), methods research (Expandir a Pesquisa)
systems dis » systems disk (Expandir a Pesquisa), systems tdis (Expandir a Pesquisa), systems dss (Expandir a Pesquisa)
cena nerve » renal nerve (Expandir a Pesquisa), beta nerve (Expandir a Pesquisa), retina nerve (Expandir a Pesquisa)
j central » 1hfj central (Expandir a Pesquisa)
nerve cn » nerve can (Expandir a Pesquisa), nerve c (Expandir a Pesquisa), nerve cat (Expandir a Pesquisa)
nerve a » nerve _ (Expandir a Pesquisa)
cn dcs » can dcs (Expandir a Pesquisa)
i cena » a cena (Expandir a Pesquisa), _ cena (Expandir a Pesquisa), e cena (Expandir a Pesquisa)
j meta » j mehta (Expandir a Pesquisa), j mena (Expandir a Pesquisa), j meca (Expandir a Pesquisa)
a dos » e dos (Expandir a Pesquisa), a dog (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 central nerve cn dcs ) or ( i cena nerve a dos ))) or ( j meta research systems dis ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j central nerve cn dcs ) OR ( i cena nerve a dos ))) OR ( j meta research systems dis )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j central nerve cn dcs ) or ( i cena nerve a dos ))) or ( j meta research systems dis ))*.