Talvez deva tentar algumas variações de ortografia:
heads compared » head compared (Expandir a Pesquisa), herds compared (Expandir a Pesquisa), seeds compared (Expandir a Pesquisa)
nat compared » fat compared (Expandir a Pesquisa), rat compared (Expandir a Pesquisa), cat compared (Expandir a Pesquisa)
compared can » compared law (Expandir a Pesquisa), companies can (Expandir a Pesquisa), compared _ (Expandir a Pesquisa)
nat computer » cat computer (Expandir a Pesquisa), fast computer (Expandir a Pesquisa), icat computer (Expandir a Pesquisa)
computer can » computers can (Expandir a Pesquisa), computer case (Expandir a Pesquisa), computer a (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa)
j heads » j head (Expandir a Pesquisa), j headd (Expandir a Pesquisa), j heales (Expandir a Pesquisa)
a netw » a neto (Expandir a Pesquisa), a neta (Expandir a Pesquisa), a netb (Expandir a Pesquisa)
j nat » j nart (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), a 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 compared can new ) or ( j heads compared a netw ))) or ( j nat computer can new ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat compared can new ) OR ( j heads compared a netw ))) OR ( j nat computer can new )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat compared can new ) or ( j heads compared a netw ))) or ( j nat computer can new ))*.