@Khanhdat0
I looked at your listing and I don't know why you didn't get any bookings. Airbnb is pushing new hosts on the front pages in the search so it is strange.
The bathroom is different than in Europe, USA or Australia but I suppose it is common in your country so at least you should get some guests from there.
I see you don't have any heating I don't know the climate in your country and if it is needed but you have A/C
Your studio looks fine and you say it is in the city center and you have self check-in. You have your calendar open for more than 6 months in advance, the price seems low, you have instant booking turned on, the minimum stay is 1 night and your first review is nice so I don't see any obvious problem.