Historical clue formulations

• ___ Tzu (dog breed) — 2020-10-04
• ___ Tzu — 2018-07-26
• ___ Tzu (dog) — 2018-06-10
• ___ Tzu (dog) — 2017-12-14
• ___-poo (designer dog) — 2016-02-20
• "___ Ching" (classic book of Chinese poetry) — 2007-11-17
• ___ Tzu — 2006-12-26
• ___ Tzu (toy dog) — 2006-09-12
• ___ Tzu (dog) — 2006-04-02
• ___ Tzu (toy dog) — 2001-12-05