Talvez deva tentar algumas variações de ortografia:
methods compared » method compared (Expandir a Pesquisa), methods comparison (Expandir a Pesquisa)
compared trinh » compared during (Expandir a Pesquisa), compared using (Expandir a Pesquisa), compare trial (Expandir a Pesquisa)
carlos nava » carlos navarro (Expandir a Pesquisa), carlos eslava (Expandir a Pesquisa), carlos zavala (Expandir a Pesquisa)
combs upon » limbs upon (Expandir a Pesquisa)
05 methods » 5 methods (Expandir a Pesquisa), 05 method (Expandir a Pesquisa), 15 methods (Expandir a Pesquisa)
trinh ngoc » dinh ngoc (Expandir a Pesquisa), minh ngoc (Expandir a Pesquisa), thanh ngoc (Expandir a Pesquisa)
upon net » upon neo (Expandir a Pesquisa), upon new (Expandir a Pesquisa), upon near (Expandir a Pesquisa)
3 null » _ null (Expandir a Pesquisa), a null (Expandir a Pesquisa), 1 null (Expandir a Pesquisa)
null a » null _ (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 _ combs upon net ) or ((( 05 methods compared trinh ngoc ) or ( 3 null a carlos nava ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs upon net ) OR ((( 05 methods compared trinh ngoc ) OR ( 3 null a carlos nava )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs upon net ) or ((( 05 methods compared trinh ngoc ) or ( 3 null a carlos nava ))))*.