This is displayed in their emotions, body language, and voice.
In modern regions such as North America, Europe, or Singapore, women have learned to put up “shields” over their true personalities as they grow to be an adult.
This is due to 1) high population 2) language 3) it’s closed-off society and should approach the country with the same idea.
The one great thing I find about Vietnamese girls (which is also frustrating for every guy out there) is their blatant transparency.
This is because it’s so easy to meet Vietnamese girls through social circles and Vietnamese dating sites (as long as it’s not your girlfriend’s social circle).