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)
combs anion » combs brandon (Expandir a Pesquisa), combs allison (Expandir a Pesquisa), combs daniel (Expandir a Pesquisa)
carlos nara » carlos lara (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos jara (Expandir a Pesquisa)
anion net » anion na (Expandir a Pesquisa), anion ni2 (Expandir a Pesquisa)
5 methods » 5 methoxy (Expandir a Pesquisa)
using qui » using quic (Expandir a Pesquisa), using quasi (Expandir a Pesquisa), using quick (Expandir a Pesquisa)
en carlos » leon carlos (Expandir a Pesquisa), jaen carlos (Expandir a Pesquisa), chen carlos (Expandir a Pesquisa)
m combs » m coombs (Expandir a Pesquisa), e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa)
nacl » natl (Expandir a Pesquisa), nac (Expandir a Pesquisa), nucl (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 m combs anion net ) or ((( 5 methods compared using qui ) or ( 0.9 nacl en carlos nara ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j m combs anion net ) OR ((( 5 methods compared using qui ) OR ( 0.9 nacl en carlos nara )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j m combs anion net ) or ((( 5 methods compared using qui ) or ( 0.9 nacl en carlos nara ))))*.