I think you should water it less.. how often do you water?

The pot is way too big for the 1st plant.

I believe it was already mentioned on another thread of yours that those clay balls mixed into soil aren't able to do anything to help the plants -- not sure what you intend them to do. Seems you just added lots more of them to the pot since the other post.

If you want this to survive pls. fix your mix w/ 50% perlite & get a smaller pot, skip the clay balls completely.

'Anh Nguyễn Thị Quế, is there a hole in the bottom of your pot for water to drain out?

Yes i do have drainage hole x)

Thanks rina and lmontestella

Normal soil contain: Coco peat, husk charcoal,... mouned (on bag just write that all)

Aww when i ask the seller about perlite he said they run out of it and he tell me to buy clay ball because it have same effect :((

Thanks all for advice :)

Clay ball would be OK except they are too large. There is no point of mixing fine soil with large particles.

To support cuttings or plants, you can use some rocks.