Talvez deva tentar algumas variações de ortografia:
model compared » model compound (Expandir a Pesquisa), model complex (Expandir a Pesquisa), model combined (Expandir a Pesquisa)
compared can » compared case (Expandir a Pesquisa), compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
a never » _ never (Expandir a Pesquisa)
j model » j modolo (Expandir a Pesquisa), j monder (Expandir a Pesquisa)
a ompr » _ ompr (Expandir a Pesquisa), a omar (Expandir a Pesquisa), a ompa (Expandir a Pesquisa)
ompr a » ompr _ (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e 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 nat compr can netw ) OR ( j a ompr a never ))) OR ( j model compared can ngoc ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat compr can netw ) OR ( j a ompr a never ))) OR ( j model compared can ngoc ))*.