Talvez deva tentar algumas variações de ortografia:
method coupled » method compared (Expandir a Pesquisa)
coupled tris » coupled traits (Expandir a Pesquisa), coupled thin (Expandir a Pesquisa), coupled twin (Expandir a Pesquisa)
knopf carlos » prof carlos (Expandir a Pesquisa)
carlos noel » carlos joel (Expandir a Pesquisa), carlos noe (Expandir a Pesquisa), carlos yoel (Expandir a Pesquisa)
combs coli » combs colin (Expandir a Pesquisa), combe colin (Expandir a Pesquisa), combs cody (Expandir a Pesquisa)
tris ngoc » trinh ngoc (Expandir a Pesquisa), trieu ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa)
nac knopf » a knopf (Expandir a Pesquisa)
5 method » 5 methods (Expandir a Pesquisa), 05 method (Expandir a Pesquisa), 15 method (Expandir a Pesquisa)
3 nac » 3 nacl (Expandir a Pesquisa), _ nac (Expandir a Pesquisa), a nac (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 _ combs coli new ) OR ((( 5 method coupled tris ngoc ) OR ( 3 nac knopf carlos noel ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs coli new ) OR ((( 5 method coupled tris ngoc ) OR ( 3 nac knopf carlos noel ))))*.