Talvez deva tentar algumas variações de ortografia:
complex tetrex » complex trex (Expandir a Pesquisa), complex tetramer (Expandir a Pesquisa), complex tethered (Expandir a Pesquisa)
metal complex » metal complexes (Expandir a Pesquisa)
nabr carlos » najar carlos (Expandir a Pesquisa), nader carlos (Expandir a Pesquisa), jair carlos (Expandir a Pesquisa)
carlos jara » carlos lara (Expandir a Pesquisa), carlos carla (Expandir a Pesquisa), carlos juca (Expandir a Pesquisa)
combs con » combs colin (Expandir a Pesquisa), combs john (Expandir a Pesquisa), combs cody (Expandir a Pesquisa)
nacl nabr » nacl kbr (Expandir a Pesquisa), nacl nano (Expandir a Pesquisa)
con note » con notas (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
l combs » e combs (Expandir a Pesquisa), _ combs (Expandir a Pesquisa), l comps (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 l combs con note ) OR ((( 5 metal complex tetrex ngo ) OR ( 7.5 nacl nabr carlos jara ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l combs con note ) OR ((( 5 metal complex tetrex ngo ) OR ( 7.5 nacl nabr carlos jara ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l combs con note ) OR ((( 5 metal complex tetrex ngo ) OR ( 7.5 nacl nabr carlos jara ))))*.