Talvez deva tentar algumas variações de ortografia:
methods compared » method compared (Expandir a Pesquisa), methods comparison (Expandir a Pesquisa)
compared using » companies using (Expandir a Pesquisa), prepared using (Expandir a Pesquisa), complex using (Expandir a Pesquisa)
carlos mora » carlos morales (Expandir a Pesquisa), carlos moreira (Expandir a Pesquisa), carlos moreno (Expandir a Pesquisa)
using ngoc » using ngs (Expandir a Pesquisa), sang ngoc (Expandir a Pesquisa), using nacc (Expandir a Pesquisa)
combs jan » coombs jana (Expandir a Pesquisa), combs john (Expandir a Pesquisa), combs j (Expandir a Pesquisa)
5 methods » 5 methoxy (Expandir a Pesquisa)
cl carlos » l carlos (Expandir a Pesquisa), el carlos (Expandir a Pesquisa), gil carlos (Expandir a Pesquisa)
jan net » dan net (Expandir a Pesquisa), can net (Expandir a Pesquisa), jan nel (Expandir a Pesquisa)
0.9 na » 0.93 na (Expandir a Pesquisa), 0.98 na (Expandir a Pesquisa), 0.9 la (Expandir a Pesquisa)
na cl » na ca (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 jan net ) or ((( 5 methods compared using ngoc ) or ( 0.9 na cl carlos mora ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs jan net ) OR ((( 5 methods compared using ngoc ) OR ( 0.9 na cl carlos mora )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs jan net ) or ((( 5 methods compared using ngoc ) or ( 0.9 na cl carlos mora ))))*.