/ɪnvɪˈteɪʃən tə nɪˈgoʊʃieɪt/ – Phrase
Definition: Lời mời thương lượng.
A more thorough explanation: a formal request for one or more offers, usually as a first step to forming a contract
Example: The Department of Health says it has issued invitations to negotiate to 11 firms interested in running new diagnostic treatment centres.