Talvez deva tentar algumas variações de ortografia:
communities based » community based (Expandir a Pesquisa), communities a (Expandir a Pesquisa), communities after (Expandir a Pesquisa)
city communities » city community (Expandir a Pesquisa), active communities (Expandir a Pesquisa), minority communities (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)
based now » based snow (Expandir a Pesquisa), based non (Expandir a Pesquisa), based no2 (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
e newton » de newton (Expandir a Pesquisa), _ newton (Expandir a Pesquisa)
a clamp » _ clamp (Expandir a Pesquisa), a claims (Expandir a Pesquisa)
clamp e » clamp em (Expandir a Pesquisa), clamp me (Expandir a Pesquisa), clamp _ (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.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j nat compr can near ) OR ( j a clamp e newton ))) OR ( _ city communities based now ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j nat compr can near ) or ( j a clamp e newton ))) or ( _ city communities based now ))*.