theurgy vs voodooism

theurgy

noun
  • A supernatural intervention in human affairs. 

  • A form of magic designed to allow for worship or conjuration of, or communication with spirits or deities. 

voodooism

noun
  • Any voodoo practice. 

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

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