Xuánzàng jīngtōng sānzàng, suǒyǐ rénmen chēng tā wéi " sānzàng fǎshī ".
Xuanzang had mastered the whole canon, so people called him the Tripitaka Master.
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藏 is read zàng here, a store of treasures as in 宝藏, not cáng 'to hide'. The title is how the monk of 西游记 got the name 唐三藏, 'the Tang Tripitaka Master'.