Talvez deva tentar algumas variações de ortografia:
norway comparing » norway comparison (Expandir a Pesquisa), norway compared (Expandir a Pesquisa), norway comparative (Expandir a Pesquisa)
compared boron » coated boron (Expandir a Pesquisa), combined boron (Expandir a Pesquisa), compared blood (Expandir a Pesquisa)
natl compared » nacl compared (Expandir a Pesquisa), nail compared (Expandir a Pesquisa), acl compared (Expandir a Pesquisa)
rat compare » rat compared (Expandir a Pesquisa), rate compare (Expandir a Pesquisa), rats compare (Expandir a Pesquisa)
boron ngoc » horn ngoc (Expandir a Pesquisa)
compare a » compare _ (Expandir a Pesquisa)
3 norway » _ norway (Expandir a Pesquisa), a norway (Expandir a Pesquisa), 1 norway (Expandir a Pesquisa)
low netw » flow nets (Expandir a Pesquisa), low neg (Expandir a Pesquisa), low neck (Expandir a Pesquisa)
2 natl » 2 nat2 (Expandir a Pesquisa), 2 nacl (Expandir a Pesquisa)
j rat » j rath (Expandir a Pesquisa), _ rat (Expandir a Pesquisa), a rat (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: (( 2 natl compared boron ngoc ) or ((( 3 norway comparing low netw ) or ( j rat compare a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 2 natl compared boron ngoc ) OR ((( 3 norway comparing low netw ) OR ( j rat compare a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 2 natl compared boron ngoc ) or ((( 3 norway comparing low netw ) or ( j rat compare a new ))))*.