Talvez deva tentar algumas variações de ortografia:
active compared » activity compared (Expandir a Pesquisa), practice compared (Expandir a Pesquisa), active compound (Expandir a Pesquisa)
rats compared » rates compared (Expandir a Pesquisa)
compared can » compared case (Expandir a Pesquisa), compared law (Expandir a Pesquisa), compared cases (Expandir a Pesquisa)
compared a » compared _ (Expandir a Pesquisa), compare a (Expandir a Pesquisa), compare _ (Expandir a Pesquisa)
j active » bhj active (Expandir a Pesquisa)
nat camp » fat camp (Expandir a Pesquisa), a camp (Expandir a Pesquisa), ac camp (Expandir a Pesquisa)
camp ca » camp a (Expandir a Pesquisa), camp c (Expandir a Pesquisa), camp camp (Expandir a Pesquisa)
ca netw » ca net (Expandir a Pesquisa)
a netw » a neto (Expandir a Pesquisa), a neta (Expandir a Pesquisa), a netb (Expandir a Pesquisa)
j rats » j rath (Expandir a Pesquisa), j raes (Expandir a Pesquisa), rij rats (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (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 active compared a netw ) or ( j rats compared can new ))) or ( _ nat camp ca netw ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j active compared a netw ) OR ( j rats compared can new ))) OR ( _ nat camp ca netw )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j active compared a netw ) or ( j rats compared can new ))) or ( _ nat camp ca netw ))*.