Talvez deva tentar algumas variações de ortografia:
complex trace » complex traces (Expandir a Pesquisa), complexed trace (Expandir a Pesquisa), complete trace (Expandir a Pesquisa)
metal complex » metal complexes (Expandir a Pesquisa)
nano carlos » cano carlos (Expandir a Pesquisa), nino carlos (Expandir a Pesquisa), nuno carlos (Expandir a Pesquisa)
carlos nava » carlos navarro (Expandir a Pesquisa), carlos eslava (Expandir a Pesquisa), carlos zavala (Expandir a Pesquisa)
trace ngoc » tran ngoc (Expandir a Pesquisa), thach ngoc (Expandir a Pesquisa), tram ngoc (Expandir a Pesquisa)
combs jan » coombs jana (Expandir a Pesquisa), combs john (Expandir a Pesquisa), combs ryan (Expandir a Pesquisa)
pcl nano » nacl nano (Expandir a Pesquisa), pcl ran (Expandir a Pesquisa), pcl zno (Expandir a Pesquisa)
jan net » dan net (Expandir a Pesquisa), can net (Expandir a Pesquisa), jan nel (Expandir a Pesquisa)
5 metal » 5 methyl (Expandir a Pesquisa)
3.5 pcl » 3.5 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 jan net ) or ((( 5 metal complex trace ngoc ) or ( 3.5 pcl nano carlos nava ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs jan net ) OR ((( 5 metal complex trace ngoc ) OR ( 3.5 pcl nano carlos nava )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs jan net ) or ((( 5 metal complex trace ngoc ) or ( 3.5 pcl nano carlos nava ))))*.