Talvez deva tentar algumas variações de ortografia:
severity compared » diversity compared (Expandir a Pesquisa), obesity compared (Expandir a Pesquisa), safety compared (Expandir a Pesquisa)
j severity » a severity (Expandir a Pesquisa), 5 severity (Expandir a Pesquisa), 1 severity (Expandir a Pesquisa)
nat clamp » dnan clamp (Expandir a Pesquisa), a clamp (Expandir a Pesquisa), dna clamp (Expandir a Pesquisa)
camp can » clamp can (Expandir a Pesquisa), camp ca (Expandir a Pesquisa), amp can (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
ac camp » a camp (Expandir a Pesquisa), c camp (Expandir a Pesquisa), amp camp (Expandir a Pesquisa)
can non » dan non (Expandir a Pesquisa), than non (Expandir a Pesquisa)
2 nat » 2 nat2 (Expandir a Pesquisa), _ nat (Expandir a Pesquisa), 2 nad (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), _ now (Expandir a Pesquisa)
_ ac » _ rac (Expandir a Pesquisa), _ a (Expandir a Pesquisa), _ c (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 clamp a now ) or ( _ ac camp can non ))) or ( j severity compared _ netw ))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (((( 2 nat clamp a now ) OR ( _ ac camp can non ))) OR ( j severity compared _ netw )).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( 2 nat clamp a now ) or ( _ ac camp can non ))) or ( j severity compared _ netw ))*.