Talvez deva tentar algumas variações de ortografia:
assay comparison » assay compared (Expandir a Pesquisa)
comparison law » comparison low (Expandir a Pesquisa), comparison land (Expandir a Pesquisa), comparison a (Expandir a Pesquisa)
nat computers » what computers (Expandir a Pesquisa), iet computers (Expandir a Pesquisa), can computers (Expandir a Pesquisa)
computers can » computers a (Expandir a Pesquisa), computers _ (Expandir a Pesquisa)
rare compared » care compared (Expandir a Pesquisa), were compared (Expandir a Pesquisa), ire compared (Expandir a Pesquisa)
j assay » _ assay (Expandir a Pesquisa), 2 assay (Expandir a Pesquisa), 1 assay (Expandir a Pesquisa)
law now » laws now (Expandir a Pesquisa), law new (Expandir a Pesquisa), law non (Expandir a Pesquisa)
j rare » j rane (Expandir a Pesquisa), j race (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": "(( _ nat computers can new ) OR ((( j assay comparison law now ) OR ( j rare compared _ new ))))~".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ nat computers can new ) OR ((( j assay comparison law now ) OR ( j rare compared _ new ))))*.