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Quisqualis indica
Hi nguyen, I've added the common and scientific names which Ceherzog suggested to your beautiful photo.
Thanks for your help.
I just know the name of the species in Vietnam, is the "Sử Quân Tử"
Its original name is Madhu Malati, Indian(when Malaysia was counted in India) originated climber. Now its urbanized due to evergreen existence and winter, summer flowering seasons.