Talvez deva tentar algumas variações de ortografia:
metil complex » metal complex (Expandir a Pesquisa), metals complex (Expandir a Pesquisa), met complex (Expandir a Pesquisa)
complex task » complex trait (Expandir a Pesquisa), complex than (Expandir a Pesquisa)
knopf carlos » prof carlos (Expandir a Pesquisa)
carlos nosek » carlos nojek (Expandir a Pesquisa), carlos noseda (Expandir a Pesquisa), carlos jose (Expandir a Pesquisa)
hobbs john » hobbs jean (Expandir a Pesquisa)
john neetu » john reetu (Expandir a Pesquisa), john neetha (Expandir a Pesquisa), john neena (Expandir a Pesquisa)
nacl knopf » nacl kno (Expandir a Pesquisa)
task ngoc » task non (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
l hobbs » j hobbs (Expandir a Pesquisa), _ hobbs (Expandir a Pesquisa), m hobbs (Expandir a Pesquisa)
5 metil » 5 methyl (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j l hobbs john neetu ) OR ((( 5 metil complex task ngoc ) OR ( 3.5 nacl knopf carlos nosek ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l hobbs john neetu ) OR ((( 5 metil complex task ngoc ) OR ( 3.5 nacl knopf carlos nosek ))))*.