Talvez deva tentar algumas variações de ortografia:
severity compared » diversity compared (Expandir a Pesquisa), obesity compared (Expandir a Pesquisa)
5 severity » _ severity (Expandir a Pesquisa), a severity (Expandir a Pesquisa), 19 severity (Expandir a Pesquisa)
nat compr » la compr (Expandir a Pesquisa), nat comm (Expandir a Pesquisa)
compr can » comp can (Expandir a Pesquisa), computer can (Expandir a Pesquisa), compared can (Expandir a Pesquisa)
nat clamp » dnan clamp (Expandir a Pesquisa), a clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
clamp can » clamp a (Expandir a Pesquisa), clamp ar (Expandir a Pesquisa), clamp cum (Expandir a Pesquisa)
can non » dan non (Expandir a Pesquisa), than non (Expandir a Pesquisa)
2 nat » 2 nat2 (Expandir a Pesquisa), 2 nas (Expandir a Pesquisa), 2 nad (Expandir a Pesquisa)
_ nat » _ net (Expandir a Pesquisa), _ nad (Expandir a Pesquisa), _ nab (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: (((( 2 nat compr can non ) or ( _ nat clamp can non ))) or ( 5 severity compared _ netw ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 2 nat compr can non ) OR ( _ nat clamp can non ))) OR ( 5 severity compared _ netw ))*.