Talvez deva tentar algumas variações de ortografia:
cardiovascular applications » cardiovascular complications (Expandir a Pesquisa)
thorac cardiovascular » thoracic cardiovascular (Expandir a Pesquisa), topic cardiovascular (Expandir a Pesquisa), toracica cardiovascular (Expandir a Pesquisa)
applications periodic » application period (Expandir a Pesquisa), applications proc (Expandir a Pesquisa), applications pacific (Expandir a Pesquisa)
periodic cancer » periodic changes (Expandir a Pesquisa), periodic counter (Expandir a Pesquisa), periodic change (Expandir a Pesquisa)
cancer sera » cancer serum (Expandir a Pesquisa), cancer self (Expandir a Pesquisa)
sera annu » sera anti (Expandir a Pesquisa)
semin » semen (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 thorac cardiovascular applications periodic cancer sera annu~.