Talvez deva tentar algumas variações de ortografia:
renal impairments » renal impairment (Expandir a Pesquisa), retinal impairments (Expandir a Pesquisa), mental impairments (Expandir a Pesquisa)
impairments than » impairment than (Expandir a Pesquisa), impairments can (Expandir a Pesquisa), impairments within (Expandir a Pesquisa)
than ngoc » thanh ngoc (Expandir a Pesquisa), thuan ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa)
capin can » capping can (Expandir a Pesquisa), pin can (Expandir a Pesquisa), capin n (Expandir a Pesquisa)
j cofala » j coal (Expandir a Pesquisa), j coale (Expandir a Pesquisa), j cola (Expandir a Pesquisa)
can ngoc » van ngoc (Expandir a Pesquisa), tran ngoc (Expandir a Pesquisa), phan ngoc (Expandir a Pesquisa)
j renal » j real (Expandir a Pesquisa), j renaldi (Expandir a Pesquisa), j renato (Expandir a Pesquisa)
clamp a » clamp _ (Expandir a Pesquisa), clamp j (Expandir a Pesquisa)
a now » a new (Expandir a Pesquisa), a non (Expandir a Pesquisa), _ now (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: (( j renal impairments than ngoc ) OR ((( j cofala clamp a now ) OR ( j nancy capin can ngoc ))))~.
• "As palabras AND, OR e NOT podem gerar pesquisas incorrectas; tente utilizar aspas": "(( j renal impairments than ngoc ) OR ((( j cofala clamp a now ) OR ( j nancy capin can ngoc ))))".
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j renal impairments than ngoc ) OR ((( j cofala clamp a now ) OR ( j nancy capin can ngoc ))))*.