sortilege vs voodooism

sortilege

noun
  • Witchcraft, magic, especially as a means of making decisions or predictions. 

voodooism

noun
  • A religious cult, from Haiti, involving witchcraft and sorcery. 

  • Any voodoo practice. 

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