Okay, the user sent "cart-horse". 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, "cart-horse" is an English phrase. I need to translate it into Vietnamese. The direct translation would be "xe bò" because "cart" is "xe" and "horse" is "bò" in Vietnamese. Wait, but "cart-horse" might be a specific term or idiom. Let me make sure. If it's a literal translation, "xe bò" is correct. However, if there's a common Vietnamese equivalent, I should use that. But I don't think there's a standard idiom for "cart-horse" in Vietnamese. So the best translation is "xe bò".
Also, the user wants only the translation, no explanations. So the response should just be "xe bò".