Talvez deva tentar algumas variações de ortografia:
comparing causes » competing causes (Expandir a Pesquisa), comparing changes (Expandir a Pesquisa), comparing cancer (Expandir a Pesquisa)
nail comparing » trail comparing (Expandir a Pesquisa), al comparing (Expandir a Pesquisa), all comparing (Expandir a Pesquisa)
comparing case » comparing cancer (Expandir a Pesquisa), compelling case (Expandir a Pesquisa), comparing climate (Expandir a Pesquisa)
la comparing » a comparing (Expandir a Pesquisa), ra comparing (Expandir a Pesquisa), cea comparing (Expandir a Pesquisa)
than never » than ever (Expandir a Pesquisa)
causes now » causes non (Expandir a Pesquisa), causes new (Expandir a Pesquisa), causes nox2 (Expandir a Pesquisa)
case netw » case new (Expandir a Pesquisa), case note (Expandir a Pesquisa), case near (Expandir a Pesquisa)
camp than » camp nathan (Expandir a Pesquisa), bump than (Expandir a Pesquisa), camp can (Expandir a Pesquisa)
nat camp » fat camp (Expandir a Pesquisa), cpt camp (Expandir a Pesquisa), cap camp (Expandir a Pesquisa)
3 nail » _ nail (Expandir a Pesquisa), 3 nacl (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (Expandir a Pesquisa)
j la » j a (Expandir a Pesquisa), j l (Expandir a Pesquisa), j da (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( j la comparing case netw ) OR ( _ nat camp than never ))) OR ( 3 nail comparing causes now ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( j la comparing case netw ) or ( _ nat camp than never ))) or ( 3 nail comparing causes now ))*.