Talvez deva tentar algumas variações de ortografia:
health competence » health competencies (Expandir a Pesquisa), health conference (Expandir a Pesquisa)
gel compared » model compared (Expandir a Pesquisa), level compared (Expandir a Pesquisa), tool compared (Expandir a Pesquisa)
competence a » competence _ (Expandir a Pesquisa), competence based (Expandir a Pesquisa)
net clamp » net class (Expandir a Pesquisa), de clamp (Expandir a Pesquisa), ez clamp (Expandir a Pesquisa)
clamp can » clamp a (Expandir a Pesquisa), clamp ar (Expandir a Pesquisa), clamp cum (Expandir a Pesquisa)
can newly » a newly (Expandir a Pesquisa), can new (Expandir a Pesquisa), men newly (Expandir a Pesquisa)
j health » j heath (Expandir a Pesquisa), bmj health (Expandir a Pesquisa), 19 health (Expandir a Pesquisa)
a gel » _ gel (Expandir a Pesquisa), i gel (Expandir a Pesquisa), a gil (Expandir a Pesquisa)
_ net » _ new (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: (((( a gel compared _ neta ) OR ( j health competence a new ))) OR ( _ net clamp can newly ))~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (((( a gel compared _ neta ) or ( j health competence a new ))) or ( _ net clamp can newly ))*.