Have a look at some of the fees being charged by the so called International Schools in HCMC
One such school could cost you US$ 275,350 for 1 pupil from year 1 to year 12. Works out at about an average of US$ 22,945 per school year. Most school years are for 182 days so that comes to US$ 126 per day. On a 6 hour teaching day that is US$ 21 per hour per pupil. That is a significant sum of money in anyone language
That excludes all the other charges such as transport,applications, school uniforms, meals, laptops, and school trips. The annual school trips are just a holiday for the many accompanying teachers who get a free jolly paid for by the pupil's parents. If you have children at an International School in HCMC try to find out the teacher pupil ratio on the annual school trip. You should have access to that information as you are paying for the teacher transport,food, and accommodation.
The bottom line is that it's your money ( or your employers) and if you want to spend such a significant sum of money on a mediocre education then go ahead. However, please remember that's all you'll be getting.