Song vs Three Kingdoms

Song

name
  • The era of Chinese history during which the dynasty reigned. 

  • A former dynasty in China, reigning from the end of the Five Dynasties and Ten Kingdoms to the beginning of the Yuan. 

  • A surname from Khmer. 

  • A former empire in China, occupying the eastern half of modern China. 

  • A surname from Chinese. 

  • A local government area of Adamawa State, Nigeria. 

  • A river in Papua New Guinea 

  • A river in China; any of various minor rivers in China. 

Three Kingdoms

name
  • The tripartite division of China between the states of Wei (魏 (Wèi)), Shu (蜀 (Shǔ)), and Wu (吳/吴 (Wú)), during AD 220–280, following the Han dynasty and preceding the Jin dynasty. 

  • The tripartite division of Korea between the kingdoms of Goguryeo (고구려(高句麗) (goguryeo)), Baekje (백제(百濟) (baekje)), and Silla (신라(新羅) (silla)), around 57 BC to AD 668, prior to its unification under Silla. 

How often have the words Song and Three Kingdoms occurred in a corpus of books? (source: Google Ngram Viewer )