Talvez deva tentar algumas variações de ortografia:
natl compra » na compra (Expandir a Pesquisa)
compra das » compras das (Expandir a Pesquisa), compra dos (Expandir a Pesquisa), compra da (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
natl amp » atl am (Expandir a Pesquisa), al amp (Expandir a Pesquisa), dall amp (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can newts (Expandir a Pesquisa), can now (Expandir a Pesquisa)
das nobs » das novas (Expandir a Pesquisa), das notas (Expandir a Pesquisa), das notes (Expandir a Pesquisa)
can net » can next (Expandir a Pesquisa), can new (Expandir a Pesquisa), dan net (Expandir a Pesquisa)
amp can » amp camp (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j natali (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (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 nat compr can net ) or ( j natl amp can netw ))) or ( j natl compra das nobs ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat compr can net ) OR ( j natl amp can netw ))) OR ( j natl compra das nobs ))*.