/tʃiːf ˈɒpəreɪtɪŋ ˈɒfɪsəʳ/ – Noun
Definition: chức vụ cao cấp quản lý hoạt động kinh doanh của một công ty.
A more thorough explanation: the person responsible for the day-to-day management of a company
Example: While the Chief Executive Officer retains overall responsibility for the management of the company, he or she often delegates the responsibility for certain divisions to the Chief Operating Officer.