Talvez deva tentar algumas variações de ortografia:
computer classes » computer clusters (Expandir a Pesquisa), computer cluster (Expandir a Pesquisa), computer case (Expandir a Pesquisa)
models computer » model computer (Expandir a Pesquisa), models computed (Expandir a Pesquisa), modems computer (Expandir a Pesquisa)
classes now » classes new (Expandir a Pesquisa), classes nos (Expandir a Pesquisa), classes na (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
j models » 1 models (Expandir a Pesquisa), 2 models (Expandir a Pesquisa), 3 models (Expandir a Pesquisa)
a clamp » _ clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa), a claims (Expandir a Pesquisa)
clamp j » clamp _ (Expandir a Pesquisa)
j newts » _ newts (Expandir a Pesquisa), j newton (Expandir a Pesquisa)
e nat » e nata (Expandir a Pesquisa), e nao (Expandir a Pesquisa), e nas (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: (((( e nat compr can near ) or ( j a clamp j newts ))) or ( j models computer classes now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( e nat compr can near ) OR ( j a clamp j newts ))) OR ( j models computer classes now )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( e nat compr can near ) or ( j a clamp j newts ))) or ( j models computer classes now ))*.