Talvez deva tentar algumas variações de ortografia:
airway comparison » assay comparison (Expandir a Pesquisa), way comparison (Expandir a Pesquisa), pairwise comparison (Expandir a Pesquisa)
comparison law » comparison low (Expandir a Pesquisa), comparison land (Expandir a Pesquisa), comparison a (Expandir a Pesquisa)
rates compared » diabetes compared (Expandir a Pesquisa)
nat2 comp » nat2 com (Expandir a Pesquisa), aav2 comp (Expandir a Pesquisa)
rij rates » rij rats (Expandir a Pesquisa), rij rat's (Expandir a Pesquisa), rij rat (Expandir a Pesquisa)
comp can » camp can (Expandir a Pesquisa), chimp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
a airway » _ airway (Expandir a Pesquisa)
law note » law notes (Expandir a Pesquisa), law noise (Expandir a Pesquisa)
can now » can new (Expandir a Pesquisa), can non (Expandir a Pesquisa), can ngoc (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 nat2 comp can now ) or ((( a airway comparison law note ) or ( rij rates compared _ new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( 2 nat2 comp can now ) OR ((( a airway comparison law note ) OR ( rij rates compared _ new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( 2 nat2 comp can now ) or ((( a airway comparison law note ) or ( rij rates compared _ new ))))*.