Talvez deva tentar algumas variações de ortografia:
nacl compared » acl compared (Expandir a Pesquisa), small compared (Expandir a Pesquisa), gel compared (Expandir a Pesquisa)
compared can » compared case (Expandir a Pesquisa), compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa)
natl romer » paul romer (Expandir a Pesquisa), nadal romero (Expandir a Pesquisa)
natl camp » al camp (Expandir a Pesquisa)
romer dan » romer a (Expandir a Pesquisa), romero da (Expandir a Pesquisa), rome dans (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
dan non » than non (Expandir a Pesquisa), dan ning (Expandir a Pesquisa)
j nacl » _ nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa), a nacl (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( j nacl compared can netw ) OR ( j natl camp can netw ))) OR ( j natl romer dan non ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nacl compared can netw ) OR ( j natl camp can netw ))) OR ( j natl romer dan non ))*.