Talvez deva tentar algumas variações de ortografia:
center survey » cluster survey (Expandir a Pesquisa)
retinal serve » retinal nerve (Expandir a Pesquisa), retinal serine (Expandir a Pesquisa), retina nerve (Expandir a Pesquisa)
survey cat » survey cats (Expandir a Pesquisa), survey can (Expandir a Pesquisa), survey calf (Expandir a Pesquisa)
bent nerve » absent nerve (Expandir a Pesquisa), mental nerve (Expandir a Pesquisa), dental nerve (Expandir a Pesquisa)
i retinal » ii retinal (Expandir a Pesquisa), a retinal (Expandir a Pesquisa), 3 retinal (Expandir a Pesquisa)
serve can » nerve can (Expandir a Pesquisa), merve can (Expandir a Pesquisa), service can (Expandir a Pesquisa)
nerve cat » nerve can (Expandir a Pesquisa), nerve case (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
a center » a century (Expandir a Pesquisa)
can da » can dan (Expandir a Pesquisa), can de (Expandir a Pesquisa), can data (Expandir a Pesquisa)
j bent » j benet (Expandir a Pesquisa), j bento (Expandir a Pesquisa), j bena (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: (((( a center survey cat due ) or ( i retinal serve can da ))) or ( j bent nerve cat due ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( a center survey cat due ) OR ( i retinal serve can da ))) OR ( j bent nerve cat due ))*.