Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex tris » complex tric (Expandir a Pesquisa), complex trs (Expandir a Pesquisa), complex traits (Expandir a Pesquisa)
marco carlos » marcio carlos (Expandir a Pesquisa), mario carlos (Expandir a Pesquisa), marcelo carlos (Expandir a Pesquisa)
carlos jara » carlos lara (Expandir a Pesquisa), carlos carla (Expandir a Pesquisa), carlos juca (Expandir a Pesquisa)
combs icus » combs locus (Expandir a Pesquisa)
nacl marco » cscl marco (Expandir a Pesquisa)
tris ngoc » trinh ngoc (Expandir a Pesquisa), trieu ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa)
icus new » virus new (Expandir a Pesquisa), locus new (Expandir a Pesquisa), focus new (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
5 metal » 5 metil (Expandir a Pesquisa), 5 methyl (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 icus new ) OR ((( 5 metal complex tris ngoc ) OR ( 3.5 nacl marco carlos jara ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j _ combs icus new ) OR ((( 5 metal complex tris ngoc ) OR ( 3.5 nacl marco carlos jara ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs icus new ) OR ((( 5 metal complex tris ngoc ) OR ( 3.5 nacl marco carlos jara ))))*.