Talvez deva tentar algumas variações de ortografia:
serrano carlos » sorzano carlos (Expandir a Pesquisa)
nacl serrano » nadal serrano (Expandir a Pesquisa), a.l serrano (Expandir a Pesquisa), sael serrano (Expandir a Pesquisa)
cobalt tris » cobalt trial (Expandir a Pesquisa), cobalt bis (Expandir a Pesquisa), cobalt thin (Expandir a Pesquisa)
carlos nora » carlos mora (Expandir a Pesquisa), carlos nara (Expandir a Pesquisa), carlos noa (Expandir a Pesquisa)
wax combs » wax comb (Expandir a Pesquisa), sex combs (Expandir a Pesquisa)
_ ethane » _ ethanol (Expandir a Pesquisa), _ ethno (Expandir a Pesquisa)
tris ngo » trips ngo (Expandir a Pesquisa), tri ngo (Expandir a Pesquisa), trinh ngo (Expandir a Pesquisa)
7.5 nacl » 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
combs c » combs _ (Expandir a Pesquisa)
a wax » a way (Expandir a Pesquisa), _ wax (Expandir a Pesquisa), a war (Expandir a Pesquisa)
c net » c neto (Expandir a Pesquisa), _ net (Expandir a Pesquisa), c neu (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: (( a wax combs c net ) OR ((( _ ethane cobalt tris ngo ) OR ( 7.5 nacl serrano carlos nora ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( a wax combs c net ) OR ((( _ ethane cobalt tris ngo ) OR ( 7.5 nacl serrano carlos nora ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( a wax combs c net ) OR ((( _ ethane cobalt tris ngo ) OR ( 7.5 nacl serrano carlos nora ))))*.