Talvez deva tentar algumas variações de ortografia:
nacl compared » acl compared (Expandir a Pesquisa), small compared (Expandir a Pesquisa), gel compared (Expandir a Pesquisa)
pcr compared » pcr combined (Expandir a Pesquisa)
compared law » compared _ (Expandir a Pesquisa), company law (Expandir a Pesquisa), compare a (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa), compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
law new » jaw new (Expandir a Pesquisa)
ad comp » d comp (Expandir a Pesquisa), ad com (Expandir a Pesquisa)
a netw » a neto (Expandir a Pesquisa), a neta (Expandir a Pesquisa), a netb (Expandir a Pesquisa)
l pcr » al pcr (Expandir a Pesquisa), sl pcr (Expandir a Pesquisa), _ pcr (Expandir a Pesquisa)
_ ad » _ bad (Expandir a Pesquisa), _ a (Expandir a Pesquisa), _ d (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": "(((( m nacl compared a netw ) OR ( l pcr compared law new ))) OR ( _ ad comp can netw ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( m nacl compared a netw ) OR ( l pcr compared law new ))) OR ( _ ad comp can netw ))*.