Talvez deva tentar algumas variações de ortografia:
computer classes » computer clusters (Expandir a Pesquisa), computer cluster (Expandir a Pesquisa), computer case (Expandir a Pesquisa)
cat compare » cat compared (Expandir a Pesquisa), cats compared (Expandir a Pesquisa), rat compared (Expandir a Pesquisa)
ip computer » _ computer (Expandir a Pesquisa), a computer (Expandir a Pesquisa), 3d computer (Expandir a Pesquisa)
classes now » classes new (Expandir a Pesquisa), classes nos (Expandir a Pesquisa), classes na (Expandir a Pesquisa)
compare a » compare _ (Expandir a Pesquisa)
c clamp » _ clamp (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
a newts » _ newts (Expandir a Pesquisa), a news (Expandir a Pesquisa), a newt (Expandir a Pesquisa)
j ip » j p (Expandir a Pesquisa), j i (Expandir a Pesquisa), j ii (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: (((( _ cat compare a near ) or ( j c clamp a newts ))) or ( j ip computer classes now ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( _ cat compare a near ) OR ( j c clamp a newts ))) OR ( j ip computer classes now ))*.