Talvez deva tentar algumas variações de ortografia:
elderly comparison » elderly compared (Expandir a Pesquisa)
comparison can » comparison cam (Expandir a Pesquisa), comparison case (Expandir a Pesquisa), comparison a (Expandir a Pesquisa)
nav1.6 complex » nsp16 complex (Expandir a Pesquisa), nac56 complex (Expandir a Pesquisa), prc1.6 complex (Expandir a Pesquisa)
complex care » complex case (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
a elderly » do elderly (Expandir a Pesquisa), near elderly (Expandir a Pesquisa), care elderly (Expandir a Pesquisa)
can near » can never (Expandir a Pesquisa)
_ nav1.6 » _ nav1.7 (Expandir a Pesquisa), _ nav1.8 (Expandir a Pesquisa), _ nav1.5 (Expandir a Pesquisa)
care new » care need (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 compr can near ) or ((( a elderly comparison can new ) or ( _ nav1.6 complex care new ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( _ nat compr can near ) OR ((( a elderly comparison can new ) OR ( _ nav1.6 complex care new )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( _ nat compr can near ) or ((( a elderly comparison can new ) or ( _ nav1.6 complex care new ))))*.