Talvez deva tentar algumas variações de ortografia:
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparing climate (Expandir a Pesquisa)
nat comparing » fat comparing (Expandir a Pesquisa), dast comparing (Expandir a Pesquisa), last comparing (Expandir a Pesquisa)
computed pain » computed brain (Expandir a Pesquisa), compounded pain (Expandir a Pesquisa), computed using (Expandir a Pesquisa)
art computed » a computed (Expandir a Pesquisa), pet computed (Expandir a Pesquisa), ct computed (Expandir a Pesquisa)
case netw » case new (Expandir a Pesquisa), case note (Expandir a Pesquisa), case near (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
la comp » la compr (Expandir a Pesquisa), la coma (Expandir a Pesquisa), la como (Expandir a Pesquisa)
can now » can non (Expandir a Pesquisa), can new (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
e la » e a (Expandir a Pesquisa), a la (Expandir a Pesquisa), y la (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(((( e la comp can now ) OR ( _ art computed pain new ))) OR ( _ nat comparing case netw ))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( e la comp can now ) OR ( _ art computed pain new ))) OR ( _ nat comparing case netw ))*.