Talvez deva tentar algumas variações de ortografia:
natl compared » nacl compared (Expandir a Pesquisa), nail compared (Expandir a Pesquisa), acl compared (Expandir a Pesquisa)
compared can » compared case (Expandir a Pesquisa), compared a (Expandir a Pesquisa), compared law (Expandir a Pesquisa)
math class » math classes (Expandir a Pesquisa), rath claus (Expandir a Pesquisa), both class (Expandir a Pesquisa)
class care » classen carl (Expandir a Pesquisa), class classe (Expandir a Pesquisa)
nata compr » nata complex (Expandir a Pesquisa), data compare (Expandir a Pesquisa)
care netw » care new (Expandir a Pesquisa), care net (Expandir a Pesquisa), care need (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
can non » dan non (Expandir a Pesquisa), than non (Expandir a Pesquisa), can ngoc (Expandir a Pesquisa)
j natl » _ natl (Expandir a Pesquisa), j nail (Expandir a Pesquisa), j nat (Expandir a Pesquisa)
j math » j mata (Expandir a Pesquisa), j matt (Expandir a Pesquisa), j mathew (Expandir a Pesquisa)
e nata » e natal (Expandir a Pesquisa), e nafta (Expandir a Pesquisa), e nada (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 natl compared can near ) or ( j math class care netw ))) or ( e nata compr can non ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j natl compared can near ) OR ( j math class care netw ))) OR ( e nata compr can non ))*.