"Good morning" in Vietnamese is "Chào buổi sáng." The greeting "Good morning" in Engpsh has its origins from Middle Engpsh "gode morwen."
Examples of usage in Engpsh:
Good morning, how are you today?
Good morning, let's start the meeting.
Examples translated to Vietnamese:
Chào buổi sáng, hôm nay bạn có khỏe không?
Chào buổi sáng, hãy bắt đầu cuộc họp nhé.