Talvez deva tentar algumas variações de ortografia:
cardiovascular control » cardiovascular care (Expandir a Pesquisa)
aortic cardiovascular » thoracic cardiovascular (Expandir a Pesquisa), diabetic cardiovascular (Expandir a Pesquisa), chronic cardiovascular (Expandir a Pesquisa)
control pediatric » controls pediatric (Expandir a Pesquisa), control paediatric (Expandir a Pesquisa), controlled pediatric (Expandir a Pesquisa)
pediatric appe » pediatric age (Expandir a Pesquisa), pediatric acute (Expandir a Pesquisa), pediatric ankle (Expandir a Pesquisa)
semin aortic » hemi aortic (Expandir a Pesquisa), german aortic (Expandir a Pesquisa), delrin aortic (Expandir a Pesquisa)
appe leads » age leads (Expandir a Pesquisa), ace leads (Expandir a Pesquisa), rpe leads (Expandir a Pesquisa)
leads anne » leads alone (Expandir a Pesquisa), lea anne (Expandir a Pesquisa), leake anne (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: semin aortic cardiovascular control pediatric appe leads anne~.
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: semin aortic cardiovascular control pediatric appe leads anne*.