Talvez deva tentar algumas variações de ortografia:
current surveys » current survey (Expandir a Pesquisa)
surveys system » survey system (Expandir a Pesquisa), survey systems (Expandir a Pesquisa), surveying system (Expandir a Pesquisa)
cent nerve » bent nerve (Expandir a Pesquisa), recent nerve (Expandir a Pesquisa), crest nerve (Expandir a Pesquisa)
system dis » system dias (Expandir a Pesquisa), system di (Expandir a Pesquisa), system das (Expandir a Pesquisa)
pgla nerve » psa nerve (Expandir a Pesquisa), glia nerve (Expandir a Pesquisa), plga nerve (Expandir a Pesquisa)
nerve eat » nerve seath (Expandir a Pesquisa), nerve exam (Expandir a Pesquisa), nerve a (Expandir a Pesquisa)
eat diet » meat diet (Expandir a Pesquisa), fat diet (Expandir a Pesquisa), wheat diet (Expandir a Pesquisa)
i cent » i cento (Expandir a Pesquisa), ai cent (Expandir a Pesquisa), ii cent (Expandir a Pesquisa)
j pgla » _ pgla (Expandir a Pesquisa), a pgla (Expandir a Pesquisa)
case d » case _ (Expandir a Pesquisa), case 1 (Expandir a Pesquisa), case 2 (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( i cent nerve eat diet ) OR ( i current surveys system dis ))) OR ( j pgla nerve case d ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( i cent nerve eat diet ) or ( i current surveys system dis ))) or ( j pgla nerve case d ))*.