Talvez deva tentar algumas variações de ortografia:
elderly comparison » elderly compared (Expandir a Pesquisa)
how computers » held computers (Expandir a Pesquisa), from computers (Expandir a Pesquisa), _ computers (Expandir a Pesquisa)
oil companies » _ companies (Expandir a Pesquisa)
companies can » companies case (Expandir a Pesquisa), companies a (Expandir a Pesquisa), companies cut (Expandir a Pesquisa)
comparison a » comparison _ (Expandir a Pesquisa), comparison among (Expandir a Pesquisa), comparison based (Expandir a Pesquisa)
computers a » computers _ (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
a now » a non (Expandir a Pesquisa), _ now (Expandir a Pesquisa), a nos (Expandir a Pesquisa)
j oil » _ oil (Expandir a Pesquisa), l oil (Expandir a Pesquisa), i oil (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( _ how computers a now ) or ((( j oil companies can now ) or ( _ elderly comparison a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ how computers a now ) OR ((( j oil companies can now ) OR ( _ elderly comparison a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ how computers a now ) or ((( j oil companies can now ) or ( _ elderly comparison a new ))))*.