Get all of the knowledge in the room first. Then you can interact with it:

梅蘭菊竹四個知識都拿到
才會有此知識

Il faut d'abord récupérer les connaissances / first start gathering these knowledge
https://bdocodex.com/th/theme/12408/
https://bdocodex.com/th/theme/12409/
https://bdocodex.com/th/theme/12410/
https://bdocodex.com/th/theme/12411/

puis parler à nouveau au bambou / then talk again to bamboo
https://bdocodex.com/th/theme/12411/

Get all 4 Sagoonja knowledges in this room first (Bamboo, Chrysanthemum, Maehwa and Orchid) Then interact with "Bamboo of Sagoonja" again, this knowledge will come up here.