Talvez deva tentar algumas variações de ortografia:
complex trace » complex traces (Expandir a Pesquisa), complexed trace (Expandir a Pesquisa), complex tracks (Expandir a Pesquisa)
metil complex » metal complex (Expandir a Pesquisa), metals complex (Expandir a Pesquisa), met complex (Expandir a Pesquisa)
carlos ayala » carlos adam (Expandir a Pesquisa)
knot carlos » knopf carlos (Expandir a Pesquisa), enout carlos (Expandir a Pesquisa), knecht carlos (Expandir a Pesquisa)
combs john » coombs john (Expandir a Pesquisa), coombes john (Expandir a Pesquisa), hobbs john (Expandir a Pesquisa)
trace ngo » trace n (Expandir a Pesquisa), trace non (Expandir a Pesquisa)
john nee » john new (Expandir a Pesquisa), john neena (Expandir a Pesquisa), john neetu (Expandir a Pesquisa)
nac knot » nara knot (Expandir a Pesquisa), nice knot (Expandir a Pesquisa), a knot (Expandir a Pesquisa)
5 metil » 5 methyl (Expandir a Pesquisa)
0.9 nac » 0.9 nacl (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 _ combs john nee ) or ((( 5 metil complex trace ngo ) or ( 0.9 nac knot carlos ayala ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs john nee ) OR ((( 5 metil complex trace ngo ) OR ( 0.9 nac knot carlos ayala )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs john nee ) or ((( 5 metil complex trace ngo ) or ( 0.9 nac knot carlos ayala ))))*.