A ward (phường) in Vietnam is an urban subdistrict. It is one of three kinds of third-level commune-level subdivisions along with the commune-level town (thị trấn), and the rural commune (xã).
The ward is subordinates to the second-level units including county-level town or the provincial city or the urban district of central-controlled municipality. Currently, for management the urban areas and associating families, each ward is divided into neighborhoods (Vietnamese: khu phố), the neighborhoods is the organization of population.
More information on the Wikipedia page .