Talvez deva tentar algumas variações de ortografia:
center survey » cluster survey (Expandir a Pesquisa)
absent serve » absent nerve (Expandir a Pesquisa), absent gene (Expandir a Pesquisa), absent self (Expandir a Pesquisa)
serve cause » nerve cause (Expandir a Pesquisa), nerve caused (Expandir a Pesquisa), nerves cause (Expandir a Pesquisa)
neck caused » neck case (Expandir a Pesquisa), neck based (Expandir a Pesquisa), neck cases (Expandir a Pesquisa)
caused due » caused acute (Expandir a Pesquisa)
j center » j centner (Expandir a Pesquisa), j centeno (Expandir a Pesquisa), j cestero (Expandir a Pesquisa)
l absent » _ absent (Expandir a Pesquisa), 1 absent (Expandir a Pesquisa), 17 absent (Expandir a Pesquisa)
cause di » cause de (Expandir a Pesquisa), cause d (Expandir a Pesquisa), cause du (Expandir a Pesquisa)
a dos » a dog (Expandir a Pesquisa), e dos (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 center survey a dos ) or ((( l absent serve cause di ) or ( _ benign neck caused due ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j center survey a dos ) OR ((( l absent serve cause di ) OR ( _ benign neck caused due ))))*.