Talvez deva tentar algumas variações de ortografia:
digital computer » digital computers (Expandir a Pesquisa), digital competence (Expandir a Pesquisa)
computer causes » computer classes (Expandir a Pesquisa), computer courses (Expandir a Pesquisa), computer case (Expandir a Pesquisa)
causes among » viruses among (Expandir a Pesquisa)
dr lacombe » _ lacombe (Expandir a Pesquisa), a lacombe (Expandir a Pesquisa), c lacombe (Expandir a Pesquisa)
claims can » claims a (Expandir a Pesquisa)
6 digital » _ digital (Expandir a Pesquisa), a digital (Expandir a Pesquisa), 3d digital (Expandir a Pesquisa)
a claims » _ claims (Expandir a Pesquisa)
d never » _ never (Expandir a Pesquisa), a never (Expandir a Pesquisa), d neves (Expandir a Pesquisa)
j dr » j r (Expandir a Pesquisa), j d (Expandir a Pesquisa), j de (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 dr lacombe d never ) OR ( j a claims can new ))) OR ( 6 digital computer causes among ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j dr lacombe d never ) OR ( j a claims can new ))) OR ( 6 digital computer causes among ))*.