Talvez deva tentar algumas variações de ortografia:
metal complex » metal complexes (Expandir a Pesquisa)
complex thin » complex than (Expandir a Pesquisa), complex within (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
caso4 carlos » caso carlos (Expandir a Pesquisa), caro carlos (Expandir a Pesquisa), casal carlos (Expandir a Pesquisa)
nacl caso4 » nacl na2so4 (Expandir a Pesquisa)
carlos noa » carlos nodal (Expandir a Pesquisa), carlos nava (Expandir a Pesquisa), carlos nara (Expandir a Pesquisa)
combs can » combs jan (Expandir a Pesquisa), combs ca (Expandir a Pesquisa), combs dan (Expandir a Pesquisa)
thin ngoc » thien ngoc (Expandir a Pesquisa), thinh ngoc (Expandir a Pesquisa), thi ngoc (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
can fes » can feu (Expandir a Pesquisa), can fresh (Expandir a Pesquisa), can feel (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 can fes ) or ((( 5 metal complex thin ngoc ) or ( 7.5 nacl caso4 carlos noa ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ combs can fes ) OR ((( 5 metal complex thin ngoc ) OR ( 7.5 nacl caso4 carlos noa )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ combs can fes ) or ((( 5 metal complex thin ngoc ) or ( 7.5 nacl caso4 carlos noa ))))*.