Talvez deva tentar algumas variações de ortografia:
knapp comparing » gap comparing (Expandir a Pesquisa)
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparing co (Expandir a Pesquisa)
nacl compare » nacl compared (Expandir a Pesquisa), acl compared (Expandir a Pesquisa), penal compare (Expandir a Pesquisa)
compare a » compare _ (Expandir a Pesquisa)
new clamp » new camp (Expandir a Pesquisa), new claims (Expandir a Pesquisa), new class (Expandir a Pesquisa)
case new » cases new (Expandir a Pesquisa), cause new (Expandir a Pesquisa), caste new (Expandir a Pesquisa)
clamp ar » clamp a (Expandir a Pesquisa), clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
en nacl » en naci (Expandir a Pesquisa), con nacl (Expandir a Pesquisa), en natal (Expandir a Pesquisa)
c knapp » m knapp (Expandir a Pesquisa), _ knapp (Expandir a Pesquisa), a knapp (Expandir a Pesquisa)
netw » net (Expandir a Pesquisa), neto (Expandir a Pesquisa), nets (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: (((( en nacl compare a new ) or ( c knapp comparing case new ))) or ( _ new clamp ar netw ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( en nacl compare a new ) OR ( c knapp comparing case new ))) OR ( _ new clamp ar netw )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( en nacl compare a new ) or ( c knapp comparing case new ))) or ( _ new clamp ar netw ))*.