One thing I found is that on the business’s social media, they list their address as 101a Nguyễn khuyến, not 101 Nguyễn khuyến as Google Maps has it listed. 101a is across the street and next to the Cung Đình restaurant. Here’s the billiards Facebook page that has the address listed as 101a:
It does seem that, at times, whoever is running their Facebook page, leaves out the a in 101a, but in their Intro and About info, it’s 101a.
Hopefully staff can take another look at this, especially since I had no issue finding the correct address info for the business on their Facebook page.