/mænˈdeɪt ˈlɛtər/ – Phrase
Definition: Thư ủy nhiệm
A more thorough explanation: a letter in which a lender (=person that provides the loan) sets out the terms on which it is prepared to lend money to the borrower (=person that receives the loan)
Example: The mandate letter issued by HSBC establishes the terms of the loan for the project.