Talvez deva tentar algumas variações de ortografia:
complex atrial » complex trial (Expandir a Pesquisa), complex arterial (Expandir a Pesquisa), complex material (Expandir a Pesquisa)
coombes john » coombs john (Expandir a Pesquisa), coombes jason (Expandir a Pesquisa), forbes john (Expandir a Pesquisa)
tail complex » oil complex (Expandir a Pesquisa), basal complex (Expandir a Pesquisa), cell complex (Expandir a Pesquisa)
atrial block » serial block (Expandir a Pesquisa), atrial blood (Expandir a Pesquisa), rural block (Expandir a Pesquisa)
nabr carlos » najar carlos (Expandir a Pesquisa), nader carlos (Expandir a Pesquisa), jair carlos (Expandir a Pesquisa)
carlos now » carlos noa (Expandir a Pesquisa), carlos noe (Expandir a Pesquisa), carlos novo (Expandir a Pesquisa)
k coombes » l coomber (Expandir a Pesquisa)
nacl nabr » nacl kbr (Expandir a Pesquisa), nacl nano (Expandir a Pesquisa)
3.5 nacl » 0.9 nacl (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 k coombes john n ) OR ((( e tail complex atrial block ) OR ( 3.5 nacl nabr carlos now ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j k coombes john n ) OR ((( e tail complex atrial block ) OR ( 3.5 nacl nabr carlos now ))))*.