Talvez deva tentar algumas variações de ortografia:
methods complex » methods coupled (Expandir a Pesquisa), methods compared (Expandir a Pesquisa), methods computer (Expandir a Pesquisa)
complex tried » complex trial (Expandir a Pesquisa), complex tree (Expandir a Pesquisa), complex trex (Expandir a Pesquisa)
hajar carlos » najar carlos (Expandir a Pesquisa), nejar carlos (Expandir a Pesquisa), baltar carlos (Expandir a Pesquisa)
combs upon » limbs upon (Expandir a Pesquisa)
tried ngoc » trieu ngoc (Expandir a Pesquisa), trinh ngoc (Expandir a Pesquisa), tien ngoc (Expandir a Pesquisa)
nacl hajar » al hajar (Expandir a Pesquisa), rachel hajar (Expandir a Pesquisa)
5 methods » 5 methoxy (Expandir a Pesquisa)
upon net » upon neo (Expandir a Pesquisa), upon new (Expandir a Pesquisa), upon near (Expandir a Pesquisa)
e combs » sex combs (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 net ) or ((( 5 methods complex tried ngoc ) or ( 3.5 nacl hajar carlos adam ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j e combs upon net ) OR ((( 5 methods complex tried ngoc ) OR ( 3.5 nacl hajar carlos adam )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j e combs upon net ) or ((( 5 methods complex tried ngoc ) or ( 3.5 nacl hajar carlos adam ))))*.