Don't let yourself get so nervous that you forget basic conversational skills. Instead, try to stay calm and open the conversation in a low-pressure way. If you've never chatted with the person online before, you may even find an excuse for talking to him, like asking a question about homework or talking about a sports team you both like. If you're texting a person for the first time, make sure he or she knows who you are and that they don't feel creeped out. Here are some ways to start a conversation through text or chatting:  "Hey, how's it going?" "Did you see/hear [insert event you both know about here]?" "How's your week going?" . The majority of people are most comfortable talking about themselves because it's a topic they know well. Instead of taking the easy way out and discussing you endlessly, encourage the other person to talk about him or herself. However, you can and should occasionally throw some personal facts in the person's direction to help them to ask questions about you in turn. The key is to leave it up to them to pursue an interest in things relevant to yourself.  This tactic actually serves two purposes: Not only does it keep the conversation going, but it allows you to find out more about your crush. You don't have to possess prior information about the other person to do this step. If you don't know him or her very well yet, you can ask:  "How did your day go?" "So, what do you do with your free time?"   If you do know the other person a bit, focus on a hobby or interest you're already aware of.  For instance, maybe he's really into basketball, or you know she loves to read. "Did you see the game last night?" or "Have you read any good books lately?" would be great starts. You can keep the discussion lively and interesting without probing too deeply on personal topics. For instance, asking your crush what exactly he or she likes about running cross-country would be a great idea; asking him or her for more details on family relationships or close friendships would be too much, too...

TL;DR in Vietnamese:
Tiếp cận một cách tự nhiên. Đừng nói về bản thân quá nhiều Biết khi nào thì cần đẩy mạnh để có thêm thông tin. Khen ngợi người ấy ở đầu cuộc hội thoại.  Trở nên can đảm Đừng quá sốt sắng. Tìm cách đảo ngược tình thế. Trêu chọc nhẹ nhàng. Khiến cho người ấy muốn nhiều hơn. Không nên quan trọng hóa mọi thứ.