Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex task » complex trait (Expandir a Pesquisa), complex than (Expandir a Pesquisa)
combs anion » combs brandon (Expandir a Pesquisa), combs allison (Expandir a Pesquisa), combs daniel (Expandir a Pesquisa)
carlos nino » carlos patino (Expandir a Pesquisa), carlos merino (Expandir a Pesquisa), carlos nunez (Expandir a Pesquisa)
kno carlos » knopf carlos (Expandir a Pesquisa), cano carlos (Expandir a Pesquisa), nino carlos (Expandir a Pesquisa)
task ngoc » task non (Expandir a Pesquisa)
anion na » anions na (Expandir a Pesquisa), anion a (Expandir a Pesquisa), anion gap (Expandir a Pesquisa)
3.5 nucl » 3.5 nacl (Expandir a Pesquisa), 34.5 null (Expandir a Pesquisa), 3 nucl (Expandir a Pesquisa)
nucl kno » nacl kno (Expandir a Pesquisa), nucl eng (Expandir a Pesquisa)
5 metal » 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 anion na ) OR ((( 5 metal complex task ngoc ) OR ( 3.5 nucl kno carlos nino ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j _ combs anion na ) OR ((( 5 metal complex task ngoc ) OR ( 3.5 nucl kno carlos nino ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs anion na ) OR ((( 5 metal complex task ngoc ) OR ( 3.5 nucl kno carlos nino ))))*.