According to regulations on employment of domestic helpers, foreign domestic helpers who have been fired must leave Hong Kong. That's to say they must leave Hong Kong for a period of time before they can come back and work in Hong Kong.
根據香港僱傭條例，俾人炒魷魚嘅外傭要過冷河，就係話要離開香港一段時間，先可以返嚟香港做嘢。