Talvez deva tentar algumas variações de ortografia:
role can » role dans (Expandir a Pesquisa), role a (Expandir a Pesquisa)
oil boom » oil booms (Expandir a Pesquisa), oil bottom (Expandir a Pesquisa), oil booty (Expandir a Pesquisa)
nac role » c role (Expandir a Pesquisa), nac core (Expandir a Pesquisa)
role van » role dans (Expandir a Pesquisa), role a (Expandir a Pesquisa), role via (Expandir a Pesquisa)
van ngoc » tran ngoc (Expandir a Pesquisa), vu ngoc (Expandir a Pesquisa), bao ngoc (Expandir a Pesquisa)
can net » can new (Expandir a Pesquisa), dan net (Expandir a Pesquisa), can nt (Expandir a Pesquisa)
oil bom » oil bomb (Expandir a Pesquisa), oil booms (Expandir a Pesquisa), oil body (Expandir a Pesquisa)
l role » l rose (Expandir a Pesquisa), l robles (Expandir a Pesquisa)
2 new » a new (Expandir a Pesquisa), _ new (Expandir a Pesquisa), 2 neu (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.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l role can net ) OR ((( l ((oil bom) OR (oil boom)) 2 new ) OR ( 3 nac role van ngoc ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l role can net ) or ((( l ((oil bom) OR (oil boom)) 2 new ) or ( 3 nac role van ngoc ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l role can net ) or ((( l ((oil bom) OR (oil boom)) 2 new ) or ( 3 nac role van ngoc ))))*.