Article in English: Half of the time, sad or stressed people aren't really looking for an answer; they just want to be heard and have a chance to vent. Do you know why they're sad? Do they seem like sharing their feelings with you?  Pull up a chair, offer a smile, and give them a shoulder to cry on. Give advice if you think it will be useful, but the main thing is that you are letting them outlet to you.  Never interrupt them in the middle of their story. Unless there is a pause that tells you commentary is okay, keep your side comments to "Oh" and "Man". Otherwise, you could come off as very rude, making them feel even worse. Seem genuinely interested in what their problem is, even if you couldn't care less or don't really know how to relate. The more interested in their problem you are, the more interested in them you seem, and isn't that the very heart of the issue? People want other people to care for them and be interested in their success. Try to communicate that. Don't let them feel like a burden. Most  of the times, people are hesitant to trust other people with their problems because they don't want the listener to feel saddled with responsibilities.So, If necessary, assure the person who needs cheering up that they aren't in any way a burden, and that you're happy to listen and offer advice if you can. There's no better way to get involved in the conversation other than asking questions, especially questions about how the other person feels. Relevant questions, however, are the key here. Asking questions that have nothing to do with the problem will confuse them, discouraging them from opening up. Here are some great general questions to ask the person in need of cheering up. Hopefully, they'll motivate the person to talk about their feelings, helping them vent:  "How does that make you feel?" "Has this ever happened to you before?" "Is there anyone specifically who you could turn to who could give you advice?" "What do you think you'll do when it comes time to act?" "Is there any way that I can help?" (Be prepared to...

Summary in Vietnamese:
Lắng nghe họ. Hỏi họ những câu hỏi liên quan. Thể hiện sự đồng cảm với họ, nếu thích hợp, nhưng hãy đảm bảo rằng bạn không lấy đi vai chính của họ. Sau khi lắng nghe, hãy cho họ lời khuyên nếu họ yêu cầu. Gặp mặt trực tiếp.