Talvez deva tentar algumas variações de ortografia:
cases comparing » cases compared (Expandir a Pesquisa), analyses comparing (Expandir a Pesquisa)
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparison case (Expandir a Pesquisa)
nart compr » nart omer (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa), nat comm (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
can netw » can net (Expandir a Pesquisa), can newts (Expandir a Pesquisa), can now (Expandir a Pesquisa)
case new » cases new (Expandir a Pesquisa), cause new (Expandir a Pesquisa), caste new (Expandir a Pesquisa)
j cases » j casey (Expandir a Pesquisa), j casares (Expandir a Pesquisa), j casper (Expandir a Pesquisa)
j nart » _ nart (Expandir a Pesquisa), j nare (Expandir a Pesquisa), j narr (Expandir a Pesquisa)
j nat » _ nat (Expandir a Pesquisa), a nat (Expandir a Pesquisa), e nat (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 nat compr can netw ) or ( j nart compr can new ))) or ( j cases comparing case new ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat compr can netw ) OR ( j nart compr can new ))) OR ( j cases comparing case new )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat compr can netw ) or ( j nart compr can new ))) or ( j cases comparing case new ))*.