Talvez deva tentar algumas variações de ortografia:
norway comparison » airway comparison (Expandir a Pesquisa), way comparison (Expandir a Pesquisa), assay comparison (Expandir a Pesquisa)
comparison three » comparison tree (Expandir a Pesquisa), comparison theorem (Expandir a Pesquisa), comparison thereof (Expandir a Pesquisa)
rat compare » rat compared (Expandir a Pesquisa), rate compare (Expandir a Pesquisa), rats compare (Expandir a Pesquisa)
three non » three new (Expandir a Pesquisa)
compare a » compare _ (Expandir a Pesquisa)
nat camp » fat camp (Expandir a Pesquisa), a camp (Expandir a Pesquisa), ac camp (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
a norway » _ norway (Expandir a Pesquisa), a norwalk (Expandir a Pesquisa)
2 nat » 2 nat2 (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), 2 nad (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 nat camp can ngoc ) or ((( a norway comparison three non ) or ( _ rat compare a new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 2 nat camp can ngoc ) OR ((( a norway comparison three non ) OR ( _ rat compare a new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 2 nat camp can ngoc ) or ((( a norway comparison three non ) or ( _ rat compare a new ))))*.