Talvez deva tentar algumas variações de ortografia:
computer classes » computer clusters (Expandir a Pesquisa), computer cluster (Expandir a Pesquisa), computer case (Expandir a Pesquisa)
labor computer » lab computer (Expandir a Pesquisa), player computer (Expandir a Pesquisa), about computer (Expandir a Pesquisa)
classes now » classes new (Expandir a Pesquisa), classes nos (Expandir a Pesquisa), classes na (Expandir a Pesquisa)
has never » have never (Expandir a Pesquisa), a never (Expandir a Pesquisa)
clamp our » camp our (Expandir a Pesquisa), clamp ou (Expandir a Pesquisa), clamp odor (Expandir a Pesquisa)
our newly » four newly (Expandir a Pesquisa), our new (Expandir a Pesquisa)
nat comp » et comp (Expandir a Pesquisa)
comp has » camp has (Expandir a Pesquisa), comp das (Expandir a Pesquisa), comp las (Expandir a Pesquisa)
a clamp » _ clamp (Expandir a Pesquisa), c clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
_ labor » _ labour (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), e nat (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 nat comp has never ) or ( j a clamp our newly ))) or ( _ labor computer classes now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat comp has never ) OR ( j a clamp our newly ))) OR ( _ labor computer classes now )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat comp has never ) or ( j a clamp our newly ))) or ( _ labor computer classes now ))*.