Talvez deva tentar algumas variações de ortografia:
complex cause » complex causes (Expandir a Pesquisa), complex case (Expandir a Pesquisa), complex care (Expandir a Pesquisa)
tail complex » oil complex (Expandir a Pesquisa), metal complex (Expandir a Pesquisa), cell complex (Expandir a Pesquisa)
nucl company » nail company (Expandir a Pesquisa), manuel company (Expandir a Pesquisa), local company (Expandir a Pesquisa)
company sars » company cars (Expandir a Pesquisa), company share (Expandir a Pesquisa), company car (Expandir a Pesquisa)
cause non » causes non (Expandir a Pesquisa)
3.5 nucl » 3.5 nacl (Expandir a Pesquisa), 34.5 null (Expandir a Pesquisa), 3 nucl (Expandir a Pesquisa)
sars how » stars how (Expandir a Pesquisa), wars how (Expandir a Pesquisa), years how (Expandir a Pesquisa)
l comet » l comer (Expandir a Pesquisa), gel comet (Expandir a Pesquisa), l collet (Expandir a Pesquisa)
comet a » comet _ (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 comet a newly ) OR ((( _ tail complex cause non ) OR ( 3.5 nucl company sars how ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l comet a newly ) OR ((( _ tail complex cause non ) OR ( 3.5 nucl company sars how ))))*.