/lɛtər ʌv ədˈvaɪs/ – Phrase
Definition: Thư tư vấn
A more thorough explanation: 1. (BUSINESS) a commercial letter informing someone of something eg that a consignment of goods has been dispatched (=sent)
2. a letter written by a lawyer to a client advising the client on some aspect of the law
Example: 1. Always include your own reference number in a letter of advice, which will usually be the file number allocated to the matter by your company or department.
2. It is common for a letter of advice to be initially sent to the client as an email attachment.