Talvez deva tentar algumas variações de ortografia:
compared causes » compared cases (Expandir a Pesquisa), compared case (Expandir a Pesquisa), comparing causes (Expandir a Pesquisa)
maple computer » apple computer (Expandir a Pesquisa), simple computer (Expandir a Pesquisa), mobile computer (Expandir a Pesquisa)
acl compared » nacl compared (Expandir a Pesquisa), al compared (Expandir a Pesquisa), gel compared (Expandir a Pesquisa)
nat compared » fat compared (Expandir a Pesquisa), rat compared (Expandir a Pesquisa), cat compared (Expandir a Pesquisa)
computer a » computer _ (Expandir a Pesquisa)
causes new » causes non (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
j maple » _ maple (Expandir a Pesquisa), a maple (Expandir a Pesquisa)
a non » _ non (Expandir a Pesquisa)
j acl » _ acl (Expandir a Pesquisa), j cl (Expandir a Pesquisa), j adl (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: (( j maple computer a non ) or ((( j acl compared causes new ) or ( e nat compared a non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j maple computer a non ) OR ((( j acl compared causes new ) OR ( e nat compared a non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j maple computer a non ) or ((( j acl compared causes new ) or ( e nat compared a non ))))*.