/ˈnæʃənl ˈsɜːrvɪs/ – Phrase
Definition: nghĩa vụ nhà nước, nghĩa vụ quân sự, nghĩa vụ lao động.
A more thorough explanation: National service refers to a compulsory period of service or work that citizens of a country are required to undertake for the benefit of the nation, typically in the military or other government-related activities.
Example: The government requires all citizens to complete two years of national service after turning 18.