The Vietnamese word "sổ tiết kiệm" translates to "savings book" in English. It is a document that you receive from a bank or a financial institution when you open a savings account. This book keeps a record of the money you deposit, withdraw, and the interest you earn over time.
While "sổ tiết kiệm" specifically refers to a savings book, the word "tiết kiệm" can also mean "to save" in a broader context, such as saving money, resources, or time.