Talvez deva tentar algumas variações de ortografia:
trail comparing » brazil comparing (Expandir a Pesquisa), strain comparing (Expandir a Pesquisa), traits comparing (Expandir a Pesquisa)
natl computers » small computers (Expandir a Pesquisa), panel computers (Expandir a Pesquisa), iet computers (Expandir a Pesquisa)
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparing climate (Expandir a Pesquisa)
call computer » small computer (Expandir a Pesquisa), scale computer (Expandir a Pesquisa), dal computer (Expandir a Pesquisa)
computers a » computers _ (Expandir a Pesquisa)
computer i » computer im (Expandir a Pesquisa), computer _ (Expandir a Pesquisa), computer a (Expandir a Pesquisa)
case now » cases now (Expandir a Pesquisa), case non (Expandir a Pesquisa), case new (Expandir a Pesquisa)
j trail » j traill (Expandir a Pesquisa), a trail (Expandir a Pesquisa), 1 trail (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
i note » i notes (Expandir a Pesquisa), ii note (Expandir a Pesquisa), vi note (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.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( j natl computers a now ) or ( _ call computer i note ))) or ( j trail comparing case now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j natl computers a now ) OR ( _ call computer i note ))) OR ( j trail comparing case now )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j natl computers a now ) or ( _ call computer i note ))) or ( j trail comparing case now ))*.