有所不知 [－－－－]

Jyutping jau5 so2 bat1 zi1
Pinyin yǒu suǒ bù zhī

Definitions (CC-CANTO)
  1. may not know; to not know something
Definitions (粵典–words.hk)
  1. x
Definitions (Wiktionary)
  1. phrase
    to be unaware of certain things