Talvez deva tentar algumas variações de ortografia:
diet comparing » diets comparing (Expandir a Pesquisa), drift comparing (Expandir a Pesquisa), dast comparing (Expandir a Pesquisa)
natl computers » small computers (Expandir a Pesquisa), units computers (Expandir a Pesquisa), panel computers (Expandir a Pesquisa)
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparing climate (Expandir a Pesquisa)
computers can » computers a (Expandir a Pesquisa), computers _ (Expandir a Pesquisa)
il computer » dal computer (Expandir a Pesquisa), line computer (Expandir a Pesquisa), vhdl computer (Expandir a Pesquisa)
computer a » computer _ (Expandir a Pesquisa)
case now » cases now (Expandir a Pesquisa), case non (Expandir a Pesquisa), case new (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
j diet » j dietz (Expandir a Pesquisa), 6j diet (Expandir a Pesquisa), j diez (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), _ now (Expandir a Pesquisa)
3 il » _ il (Expandir a Pesquisa), 3 yl (Expandir a Pesquisa), e il (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 natl computers can now ) OR ( 3 il computer a now ))) OR ( j diet comparing case now ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j natl computers can now ) OR ( 3 il computer a now ))) OR ( j diet comparing case now ))*.