Talvez deva tentar algumas variações de ortografia:
local computer » novel computer (Expandir a Pesquisa), medical computer (Expandir a Pesquisa)
natl compared » nacl compared (Expandir a Pesquisa), nail compared (Expandir a Pesquisa), acl compared (Expandir a Pesquisa)
computer can » computers can (Expandir a Pesquisa), computer case (Expandir a Pesquisa), computer a (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa), compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
math amp » math game (Expandir a Pesquisa), smith amp (Expandir a Pesquisa), math p (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
amp can » amp camp (Expandir a Pesquisa)
j local » bmj local (Expandir a Pesquisa), j locane (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
j math » j mata (Expandir a Pesquisa), j matt (Expandir a Pesquisa), j mathew (Expandir a Pesquisa)
_ natl » _ natal (Expandir a Pesquisa), _ nat'l (Expandir a Pesquisa), _ nato (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.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j math amp can netw ) OR ((( j local computer can now ) OR ( _ natl compared a now ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j math amp can netw ) OR ((( j local computer can now ) OR ( _ natl compared a now ))))*.