Okay, the user sent "re-boot". Let me check the translation rules again. The first rule says to translate all content into Vietnamese. The second rule states that if the content is already in Vietnamese, output it unchanged. The third rule is to provide only the translation result with no explanations.
So, "re-boot" is in English. I need to translate it into Vietnamese. The correct translation for "re-boot" in Vietnamese is "khởi động lại" or "khởi động hệ thống lại". But since the user might be referring to a computer or device, "khởi động lại" is more commonly used. I should make sure there's no existing Vietnamese text that needs to be left as is. Since the input is in English, I proceed with the translation. No explanations, just the translation. So the answer should be "khởi động lại".