Talvez deva tentar algumas variações de ortografia:
elderly comparison » elderly compared (Expandir a Pesquisa)
comparison risk » comparing risk (Expandir a Pesquisa), comparison case (Expandir a Pesquisa), comparison fast (Expandir a Pesquisa)
comole cause » complex cause (Expandir a Pesquisa), commonly cause (Expandir a Pesquisa), homolog cause (Expandir a Pesquisa)
chimp can » chip can (Expandir a Pesquisa), camp can (Expandir a Pesquisa), clamp can (Expandir a Pesquisa)
e elderly » _ elderly (Expandir a Pesquisa), a elderly (Expandir a Pesquisa), 2 elderly (Expandir a Pesquisa)
cause new » causes new (Expandir a Pesquisa), use new (Expandir a Pesquisa), cause non (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa), can new (Expandir a Pesquisa)
risk new » risk non (Expandir a Pesquisa)
3 nucl » 3 null (Expandir a Pesquisa)
nat » natl (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( _ nat chimp can near ) or ((( e elderly comparison risk new ) or ( 3 nucl comole cause new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ nat chimp can near ) OR ((( e elderly comparison risk new ) OR ( 3 nucl comole cause new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ nat chimp can near ) or ((( e elderly comparison risk new ) or ( 3 nucl comole cause new ))))*.