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 upon » limbs upon (Expandir a Pesquisa)
using ngoc » using ngs (Expandir a Pesquisa), sang ngoc (Expandir a Pesquisa), using nacc (Expandir a Pesquisa)
5 methods » 5 methoxy (Expandir a Pesquisa)
en carlos » jaen carlos (Expandir a Pesquisa), gean carlos (Expandir a Pesquisa), chen carlos (Expandir a Pesquisa)
upon new » upon neo (Expandir a Pesquisa), upon net (Expandir a Pesquisa), upon near (Expandir a Pesquisa)
e combs » sex combs (Expandir a Pesquisa)
0.9 pac » 0.9 nacl (Expandir a Pesquisa)
pac en » pnac en (Expandir a Pesquisa), spac en (Expandir a Pesquisa), vac en (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 e combs upon new ) or ((( 5 methods compared using ngoc ) or ( 0.9 pac en carlos morales ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j e combs upon new ) OR ((( 5 methods compared using ngoc ) OR ( 0.9 pac en carlos morales )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j e combs upon new ) or ((( 5 methods compared using ngoc ) or ( 0.9 pac en carlos morales ))))*.