As a general rule, you should wait 2 weeks to a month before making any contact with your ex. Making contact first and making contact quickly will send the message that you miss your ex, which, oddly enough, is not the message you want to send in order to make your ex miss you in return. In addition, staying in contact with the person does not give your ex a chance to miss you because are still chatting. At the start of a breakup, your ex might feel confident that you will cave in and be the first to call. After a week or two passes without word from you, your ex will start wondering why you have not called and may even start to feel angry. After another week or two, you will be on your ex's mind so much that he/she might be willing to acknowledge that he or she misses you. Within the first few weeks of your breakup, you should not return your ex's calls even if he/she contacts you first. Your ex might call you looking for a quick, temporary fix to get himself or herself through the initial hurt. However, if you want your ex to really, honestly miss you, you need to drag out the waiting period longer so that stronger feelings of nostalgia can form. One way to completely cut ties is to take a vacation. That way, you can't just run into your ex somewhere. In addition, it'll give you the break you need. Another reason to cut ties is you need time to heal. If you broke up, you're obviously upset. You need time to evaluate what went wrong, especially if you are trying to get back together, and taking a step away from the other person can give you the time you need.  During this month, get out of the house. Go do something you enjoy, by yourself or with friends. Get used to being independent and single. Regaining your independence can help you bring a new perspective to the relationship if you do get back together.  In addition, you'll be happier and healthier, making your ex miss you more. If you're stalking the person, you're not taking the space you need. Plus, if you get caught, you look desperate, which is not...

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Write a summary of the previous text in Vietnamese:
Đừng chủ động liên lạc trước. Đừng nhận cuộc gọi hoặc trả lời tin nhắn của người đó. Cân nhắc tới việc rời khỏi thành phố. Dành thời gian để trấn tĩnh lại. Đừng bám đuôi người yêu cũ. Đừng thông báo về nỗi buồn của bản thân.