/bʌɪ (ɒn) rɪˈkwɛst/ – Phrase
Definition: theo yêu cầu.
A more thorough explanation: “By (on) request” means that something is done or provided in response to a specific demand or inquiry made by someone. It indicates that the action was carried out as a result of a formal or informal request from an individual or entity.
Example: The documents will be provided by request.