Talvez deva tentar algumas variações de ortografia:
elderly comared » elderly compared (Expandir a Pesquisa), elderly cared (Expandir a Pesquisa), elderly comorbid (Expandir a Pesquisa)
comared cases » compared cases (Expandir a Pesquisa), collared cases (Expandir a Pesquisa), compared case (Expandir a Pesquisa)
do elderly » _ elderly (Expandir a Pesquisa), from elderly (Expandir a Pesquisa)
nasal comp » nasal com (Expandir a Pesquisa), nasal como (Expandir a Pesquisa), nasal cpap (Expandir a Pesquisa)
chimp can » chip can (Expandir a Pesquisa), chirp can (Expandir a Pesquisa), camp can (Expandir a Pesquisa)
cases now » cases new (Expandir a Pesquisa), cases non (Expandir a Pesquisa), case now (Expandir a Pesquisa)
comp tran » comp trad (Expandir a Pesquisa), pomp trap (Expandir a Pesquisa)
3d nasal » 3d nas (Expandir a Pesquisa)
can net » can new (Expandir a Pesquisa), dan net (Expandir a Pesquisa), can nt (Expandir a Pesquisa)
ngoc » ngo (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: (( j _ chimp can net ) or ((( do elderly comared cases now ) or ( 3d nasal comp tran ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j _ chimp can net ) OR ((( do elderly comared cases now ) OR ( 3d nasal comp tran ngoc )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j _ chimp can net ) or ((( do elderly comared cases now ) or ( 3d nasal comp tran ngoc ))))*.