Talvez deva tentar algumas variações de ortografia:
renal impairment » visual impairment (Expandir a Pesquisa)
impairment than » impairment can (Expandir a Pesquisa), impairment tau (Expandir a Pesquisa), impairment a (Expandir a Pesquisa)
coal clamp » coil clamp (Expandir a Pesquisa), cell clamp (Expandir a Pesquisa), stomal clamp (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)
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)
j coal » j coale (Expandir a Pesquisa), j coan (Expandir a Pesquisa), j cofala (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 impairment than ngoc ) or ((( j coal clamp a now ) or ( j nancy capin can ngoc ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j renal impairment than ngoc ) OR ((( j coal clamp a now ) OR ( j nancy capin can ngoc )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j renal impairment than ngoc ) or ((( j coal clamp a now ) or ( j nancy capin can ngoc ))))*.