Hiểu rõ ẩn ý. Lắng nghe giọng điệu của người đó. Xác định xem người nào đang dẫn dắt cuộc trò chuyện. Lắng nghe lời hồi đáp. Quan sát quá trình giao tiếp bằng mắt. Chú ý đến vị trí của cơ thể. Kiểm ra ngôn ngữ cơ thể.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
If you’re texting or using social media sites, you cannot see their body language or hear their tone unless you are having a video call. But by reading responses and seeing how long it takes for the person to respond, you can gauge if the person doesn’t want to talk to you.  Look for a “read” indication on sites like Facebook, Instagram, or Whatsapp. If there is a long lapse between your text and the response, or if the person doesn’t respond at all, she likely doesn’t want to talk to you. You c