Talvez deva tentar algumas variações de ortografia:
model compared » model compound (Expandir a Pesquisa), model complex (Expandir a Pesquisa), model combined (Expandir a Pesquisa)
led companies » lead companies (Expandir a Pesquisa), listed companies (Expandir a Pesquisa), based companies (Expandir a Pesquisa)
companies cut » companies act (Expandir a Pesquisa), companies can (Expandir a Pesquisa), companies case (Expandir a Pesquisa)
gas companies » based companies (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
cut now » gut now (Expandir a Pesquisa), cut down (Expandir a Pesquisa), cut node (Expandir a Pesquisa)
a netw » a neto (Expandir a Pesquisa), a neta (Expandir a Pesquisa), a netb (Expandir a Pesquisa)
va led » uva led (Expandir a Pesquisa), via led (Expandir a Pesquisa), da led (Expandir a Pesquisa)
3 gas » _ gas (Expandir a Pesquisa), a gas (Expandir a Pesquisa), e gas (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ model compared a netw ) OR ((( va led companies cut now ) OR ( 3 gas companies cut now ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ model compared a netw ) or ((( va led companies cut now ) or ( 3 gas companies cut now ))))*.