Talvez deva tentar algumas variações de ortografia:
complex concept » complex concepts (Expandir a Pesquisa), complex context (Expandir a Pesquisa), complex connects (Expandir a Pesquisa)
combat colon » combat covid (Expandir a Pesquisa), combat boot (Expandir a Pesquisa)
ttt complex » ift complex (Expandir a Pesquisa), cst complex (Expandir a Pesquisa), mt complex (Expandir a Pesquisa)
nacl bacino » nel bacino (Expandir a Pesquisa)
carlos nara » carlos lara (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos jara (Expandir a Pesquisa)
le combat » de combat (Expandir a Pesquisa), _ combat (Expandir a Pesquisa), a combat (Expandir a Pesquisa)
concept a » concept _ (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
colon w » colon _ (Expandir a Pesquisa), colon a (Expandir a Pesquisa), colon 2 (Expandir a Pesquisa)
5 ttt » 5 htt (Expandir a Pesquisa), _ ttt (Expandir a Pesquisa), 5 tt (Expandir a Pesquisa)
j le » j l (Expandir a Pesquisa), j e (Expandir a Pesquisa), j de (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 le combat colon w ) OR ((( 5 ttt complex concept a ) OR ( 7.5 nacl bacino carlos nara ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j le combat colon w ) OR ((( 5 ttt complex concept a ) OR ( 7.5 nacl bacino carlos nara ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j le combat colon w ) OR ((( 5 ttt complex concept a ) OR ( 7.5 nacl bacino carlos nara ))))*.