Talvez deva tentar algumas variações de ortografia:
elderly compared » elderly comparison (Expandir a Pesquisa), elderly care (Expandir a Pesquisa)
vhdl computers » vhdl computer (Expandir a Pesquisa), held computers (Expandir a Pesquisa), how computers (Expandir a Pesquisa)
compared cause » compared case (Expandir a Pesquisa), complex cause (Expandir a Pesquisa), compare mouse (Expandir a Pesquisa)
computers dan » computers can (Expandir a Pesquisa), computers data (Expandir a Pesquisa), computers a (Expandir a Pesquisa)
nacl compared » acl compared (Expandir a Pesquisa), small compared (Expandir a Pesquisa), gel compared (Expandir a Pesquisa)
cause new » causes new (Expandir a Pesquisa), use new (Expandir a Pesquisa), cause non (Expandir a Pesquisa)
a elderly » _ elderly (Expandir a Pesquisa), care elderly (Expandir a Pesquisa)
dan non » than non (Expandir a Pesquisa), dan ning (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: (( _ vhdl computers dan non ) or ((( m nacl compared cause new ) or ( a elderly compared _ non ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ vhdl computers dan non ) OR ((( m nacl compared cause new ) OR ( a elderly compared _ non )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ vhdl computers dan non ) or ((( m nacl compared cause new ) or ( a elderly compared _ non ))))*.