Talvez deva tentar algumas variações de ortografia:
real complex » reveal complex (Expandir a Pesquisa), lethal complex (Expandir a Pesquisa), herbal complex (Expandir a Pesquisa)
complex tran » complex trans (Expandir a Pesquisa), complex tehran (Expandir a Pesquisa), complex trait (Expandir a Pesquisa)
kbr carlos » dr carlos (Expandir a Pesquisa), cyr carlos (Expandir a Pesquisa), aybar carlos (Expandir a Pesquisa)
carlos now » carlos noe (Expandir a Pesquisa), carlos noa (Expandir a Pesquisa), carlos novo (Expandir a Pesquisa)
7.2 nacl » 7.5 nacl (Expandir a Pesquisa), 3.5 nacl (Expandir a Pesquisa), 0.9 nacl (Expandir a Pesquisa)
nacl kbr » nacl nabr (Expandir a Pesquisa), nacl kcl (Expandir a Pesquisa), nacl kno (Expandir a Pesquisa)
l comps » m comps (Expandir a Pesquisa)
comps c » compes c (Expandir a Pesquisa), camps c (Expandir a Pesquisa), comps i (Expandir a Pesquisa)
c need » c needs (Expandir a Pesquisa), _ need (Expandir a Pesquisa), a need (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 comps c need ) OR ((( 50 real complex tran ngoc ) OR ( 7.2 nacl kbr carlos now ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l comps c need ) OR ((( 50 real complex tran ngoc ) OR ( 7.2 nacl kbr carlos now ))))*.