The Vietnamese phrase "ăn cơm tháng" literally translates to "to eat monthly rice" in English, but its meaning is more specific. It refers to the act of boarding or living at a place where meals (usually rice) are provided regularly, typically in a communal or shared setting. It is often used in the context of students or workers who stay at boarding houses or dormitories.
"Ăn cơm tháng" is quite specific and does not have many different meanings. However, it emphasizes the communal aspect of eating and living arrangements.