Okay, the user sent "tie-off". Let me check the translation rules again. The first rule is to translate all content into Vietnamese. The second says if it's already in Vietnamese, leave it as is. Third, only provide the translation without explanations.
So, "tie-off" is an English term. I need to translate it into Vietnamese. What does "tie-off" mean? It can mean to tie something off, like securing a rope or ending a task. In Vietnamese, the equivalent might be "buộc chặt" or "kết thúc". But I should check the context. Since there's no context provided, the most direct translation would be "buộc chặt" which is commonly used for tying something securely. Alternatively, if it's used in a medical or technical context, there might be a specific term, but without more info, "buộc chặt" is safe. Also, the user wants only the translation, so I shouldn't add anything else. Let me confirm if "tie-off" is a standard term in Vietnamese. Maybe "kết thúc" is another option, but "buộc chặt" seems more accurate for the action of tying off. Alright, I'll go with "buộc chặt".