Talvez deva tentar algumas variações de ortografia:
retinal nerves » retinal nerve (Expandir a Pesquisa), renal nerves (Expandir a Pesquisa), retina nerve (Expandir a Pesquisa)
cento nerve » bent nerve (Expandir a Pesquisa), central nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
nerves cat » nerves can (Expandir a Pesquisa), nerves case (Expandir a Pesquisa), nerves fate (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve ct (Expandir a Pesquisa), nerve cut (Expandir a Pesquisa)
d retinal » 3d retinal (Expandir a Pesquisa), 2d retinal (Expandir a Pesquisa), d retina (Expandir a Pesquisa)
cat diet » cat diets (Expandir a Pesquisa), fat diet (Expandir a Pesquisa), eat diet (Expandir a Pesquisa)
ai cent » i cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa), ai centri (Expandir a Pesquisa)
cat dis » cat did (Expandir a Pesquisa), cat diets (Expandir a Pesquisa), cat bias (Expandir a Pesquisa)
i cento » a cento (Expandir a Pesquisa), i censo (Expandir a Pesquisa), i centeno (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: (((( ai cent nerve cat dis ) or ( i cento nerve cat dis ))) or ( d retinal nerves cat diet ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( ai cent nerve cat dis ) OR ( i cento nerve cat dis ))) OR ( d retinal nerves cat diet )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( ai cent nerve cat dis ) or ( i cento nerve cat dis ))) or ( d retinal nerves cat diet ))*.