Talvez deva tentar algumas variações de ortografia:
stay compared » assay compared (Expandir a Pesquisa), spray compared (Expandir a Pesquisa), state compared (Expandir a Pesquisa)
unit computer » units computers (Expandir a Pesquisa), tunis computer (Expandir a Pesquisa), ut computer (Expandir a Pesquisa)
computer can » computers can (Expandir a Pesquisa), computer case (Expandir a Pesquisa), computer a (Expandir a Pesquisa)
compared low » compared law (Expandir a Pesquisa), compare low (Expandir a Pesquisa), compare slow (Expandir a Pesquisa)
can netw » can new (Expandir a Pesquisa), can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
j unit » j unio (Expandir a Pesquisa), b unit (Expandir a Pesquisa)
j stay » j stacy (Expandir a Pesquisa), j stan (Expandir a Pesquisa), j stam (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 unit computer can netw ) OR ( j a camp can ngoc ))) OR ( j stay compared low noise ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j unit computer can netw ) OR ( j a camp can ngoc ))) OR ( j stay compared low noise ))*.