Talvez deva tentar algumas variações de ortografia:
model compared » model compound (Expandir a Pesquisa), model complex (Expandir a Pesquisa), model combined (Expandir a Pesquisa)
natali clamp » natali lama (Expandir a Pesquisa), natalie clark (Expandir a Pesquisa), natalia claro (Expandir a Pesquisa)
compared ha » compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
m natali » m natalia (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
ha ngoc » pham ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), _ now (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": "(( _ model compared ha ngoc ) OR ((( m natali clamp a now ) OR ( j a camp can now ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ model compared ha ngoc ) OR ((( m natali clamp a now ) OR ( j a camp can now ))))*.