Talvez deva tentar algumas variações de ortografia:
comperj canc » comperj na (Expandir a Pesquisa)
compra can » compra con (Expandir a Pesquisa), compra en (Expandir a Pesquisa), compra da (Expandir a Pesquisa)
l comperj » o comperj (Expandir a Pesquisa), _ comperj (Expandir a Pesquisa), l comper (Expandir a Pesquisa)
canc netw » canc lett (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)
la compra » la comarca (Expandir a Pesquisa), de compra (Expandir a Pesquisa), la comida (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (Expandir a Pesquisa)
j la » j a (Expandir a Pesquisa), j da (Expandir a Pesquisa), j li (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 l comperj canc netw ) OR ((( j nat compr can netw ) OR ( j la compra can netw ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l comperj canc netw ) OR ((( j nat compr can netw ) OR ( j la compra can netw ))))*".