Talvez deva tentar algumas variações de ortografia:
computer classes » computer clusters (Expandir a Pesquisa), computer cluster (Expandir a Pesquisa), computer case (Expandir a Pesquisa)
maple computer » apple computer (Expandir a Pesquisa), simple computer (Expandir a Pesquisa), mobile computer (Expandir a Pesquisa)
age compared » care compared (Expandir a Pesquisa), damage compared (Expandir a Pesquisa), home compared (Expandir a Pesquisa)
classes now » classes new (Expandir a Pesquisa), classes nos (Expandir a Pesquisa), classes na (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
camp camp » amp camp (Expandir a Pesquisa)
camp netw » camp near (Expandir a Pesquisa), camp nerf (Expandir a Pesquisa)
ac camp » a camp (Expandir a Pesquisa), c camp (Expandir a Pesquisa), amp camp (Expandir a Pesquisa)
j maple » _ maple (Expandir a Pesquisa), a maple (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: (( _ ac camp camp netw ) or ((( j maple computer classes now ) or ( _ age compared a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ ac camp camp netw ) OR ((( j maple computer classes now ) OR ( _ age compared a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ ac camp camp netw ) or ((( j maple computer classes now ) or ( _ age compared a new ))))*.