Once you have broken the ice, there are several things you can do to keep the conversation going. Asking questions is a great way to continue the dialogue. Try asking the other person to do something simple for you.  For example, if you are picking your child up at school, you can say to another mom, "Can you remind me what time the early dismissal is tomorrow?" You could ask your colleague to offer you some advice. Consider saying, "Brad, your Powerpoints always look so polished. Would you mind offering me some tips?" Asking any question is a great way to get the conversation going. But open-ended questions are the key to keeping the chat flowing. Ask questions that require much more than a yes or no answer.  Instead of saying, "How was your trip to Phoenix?" try saying, "I remember you saying you were traveling. What sorts of things did you do on your vacation?" This will allow for elaboration. Continue asking questions after the initial response. If the person says, "We did a lot of golfing", you can say, "Oh, what's your handicap? Can you recommend any good courses? I'd love to improve my game." You can also turn compliments into questions. For example, you could say, "I really love that dress you're wearing. How do you find such great pieces?" Don't try to force a conversation. Instead, try talking about something that you genuinely care about. If you are feigning interest, it will usually be evident.  At a dinner party, strike up a conversation with someone who shares your interest. For example, you could say, "Mike, I hear you just got a new bike. I love going on trail rides." When you are at your daughter's soccer game, try talking to another parent about the new coach. For instance, "I feel like Haley is responding well to the extra practice time. How's Mary handling it?" After you have been chatting for a few moments, you might feel more comfortable with how the conversation is going. But you still need to make an effort to make the conversation flow smoothly. Part of being a good conversationalist...

TL;DR in Vietnamese:
Nêu lên câu hỏi. Đưa ra câu hỏi mở. Hãy chân thành. Tránh xa tác nhân gây hủy hoại cuộc trò chuyện. Chuyển chủ đề. Trò chuyện với nhiều người khác. Trở thành người biết lắng nghe.