Talvez deva tentar algumas variações de ortografia:
complex concept » complex concepts (Expandir a Pesquisa), complex context (Expandir a Pesquisa), complex connects (Expandir a Pesquisa)
arts complex » warts complex (Expandir a Pesquisa), art complex (Expandir a Pesquisa), its complex (Expandir a Pesquisa)
carlos nejar » carlos negrao (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa)
covid new » covid e (Expandir a Pesquisa), covid de (Expandir a Pesquisa), covid en (Expandir a Pesquisa)
concept a » concept _ (Expandir a Pesquisa)
en carlos » leon carlos (Expandir a Pesquisa), jaen carlos (Expandir a Pesquisa), chen carlos (Expandir a Pesquisa)
a combat » _ combat (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
5 arts » _ arts (Expandir a Pesquisa), 6 arts (Expandir a Pesquisa), i arts (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 a combat covid new ) or ((( 5 arts complex concept a ) or ( 3.5 nacl en carlos nejar ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j a combat covid new ) OR ((( 5 arts complex concept a ) OR ( 3.5 nacl en carlos nejar )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j a combat covid new ) or ((( 5 arts complex concept a ) or ( 3.5 nacl en carlos nejar ))))*.