There is no doubt about this, as evidenced by his book "The Tale of the Western Regions of Datang" and a large number of untranslated Buddhist scriptures brought back from India. Because ancient India has never formed a unified country, they have no history after the war, and they regard the contents recorded in the records of the Western Regions of Datang as their own history. These are not enough to prove that Xuanzang has been to India?