Viết lời chào ở dòng đầu tiên. Sử dụng dấu phẩy. Di chuyển tới dòng tiếp theo. Giới thiệu bản thân trong câu mở đầu nếu cần thiết. Đi thẳng vào chủ đề.

Given the above summary, write a detailed text in English for it.
The top line should be the greeting you've chosen, followed by the person's name. Use a title for the person when possible, such as Mr., Mrs., or Dr., followed by their first and last name. Generally, you'll use a comma after the greeting. In formal letters, you can use a colon, but that is usually too formal for an email, even a formal one. A comma will suffice in most instances, though you might use a colon if you are writing a cover letter in an email. The greeting goes on its own line at the top, so once you've written it, hit the return key to move to the next line. If you're using line breaks instead of indentions to make paragraphs, you'll need to leave a blank line between the greeting and the first paragraph. If you are writing someone for the first time, you should provide an introduction, even if you know the person in real life. Giving the person a clue to who you are encourages them to keep reading.  For example, you could write, "My name is Jessica Hills, and I am the marketing director for XYZ Company." You could also include how you know the person: "My name is Robert Smith, and I'm in your marketing class (Marketing 101 that meets Tuesdays and Thursdays at noon)." If you already know the person and have written them before, you can use the first sentence as a greeting. For instance, you could say, "Thank you for getting back to me so quickly," or "I hope you are doing well." Most formal emails need to get to the point quickly. That means that your first or second sentence should introduce the reason why you're writing to the recipient. Remember to be as concise as possible when describing your purpose. For example, you could write, "I'm writing to ask for your assistance with a marketing problem," or "I'm writing you because I'm having trouble in class, and I was hoping you'd have suggestions for extra material I could read to help."