This Mantra is especially linked to the 4-armed Shadakshari sort of Avalokiteśvara. The Dalai Lama is claimed being an incarnation of Avalokiteshvara, and Hence the mantra is very revered by his devotees. The Chinese translation is 真言; zhenyan; 'genuine phrases', the Japanese on'yomi reading on the Chinese becoming shingon (which https://www.instagram.com/tantramantraaurvigyaan/