Talvez deva tentar algumas variações de ortografia:
nat compra » na compra (Expandir a Pesquisa), la compra (Expandir a Pesquisa), da compra (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)
compra da » compra de (Expandir a Pesquisa), compra do (Expandir a Pesquisa), compra dos (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
fat camp » fat amp (Expandir a Pesquisa), fat can (Expandir a Pesquisa), cpt camp (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
da non » da nona (Expandir a Pesquisa), da nan (Expandir a Pesquisa), da noz (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (Expandir a Pesquisa)
j fat » j fath (Expandir a Pesquisa), _ fat (Expandir a Pesquisa), a fat (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 near ) OR ( j fat camp can netw ))) OR ( j nat compra da non ))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( j nat compr can near ) OR ( j fat camp can netw ))) OR ( j nat compra da non ))*".