/spaɪˈ/ – noun
Definition: gián điệp, do thám, làm gián điệp, theo dõi ngầm.
A more thorough explanation: A spy is a person who secretly collects and reports information about the activities, movements, or plans of an enemy or competitor, typically for a government or intelligence agency.
Example: The government accused the individual of espionage for acting as a spy and passing classified information to a foreign entity.