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 boot » combat root (Expandir a Pesquisa), combat colon (Expandir a Pesquisa), combat ebola (Expandir a Pesquisa)
cst complex » coat complex (Expandir a Pesquisa), ift complex (Expandir a Pesquisa), corest complex (Expandir a Pesquisa)
meat carlos » matt carlos (Expandir a Pesquisa), fett carlos (Expandir a Pesquisa), smet carlos (Expandir a Pesquisa)
a combat » _ combat (Expandir a Pesquisa)
nac meat » nacl meat (Expandir a Pesquisa), a meat (Expandir a Pesquisa), eat meat (Expandir a Pesquisa)
7.5 nac » 7.5 nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa)
boot j » boot _ (Expandir a Pesquisa)
_ cst » _ csf (Expandir a Pesquisa), _ csr (Expandir a Pesquisa), _ csk (Expandir a Pesquisa)
negrao » negras (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j a combat boot j ) OR ((( _ cst complex concept _ ) OR ( 7.5 nac meat carlos negrao ))))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j a combat boot j ) or ((( _ cst complex concept _ ) or ( 7.5 nac meat carlos negrao ))))*.