First, read the English article below.

The business letter will be a representation of your company. So it should look distinct and high quality. It should also bear your company’s logo or brand. You can create a letterhead using predesigned color letterhead templates in Microsoft word. Be sure to use your existing logo or brand in the letterhead. You should always type up a business letter on a computer.  Create a new document and set up 1 inch margins for the document.  Use a serif font such as Times New Roman, Georgia or Ariel. Be sure to use a font size that is no larger than 12 points, but no smaller than 10 points. The letter should not be difficult to read because of font choice or font size. Make sure the document is set to single spaced. The block form is the most common format used for business letters. It is also the easiest to setup and follow. Each heading must be left aligned and there should be one space between each heading. Beginning from the top the bottom of the document, your business letter should have the following headings:  Today’s date, or the date you are sending the letter. The date is important as it can be used for your records and the receiver’s records. As well, it may have legal use. So make sure it is accurate. The sender’s address. This is your address, formatted in the standard address style. If your address already appears in your letterhead, you can skip this heading. The inside address. This is the name and address of the person you are writing to. The use of Mr/Mrs is optional. So, for example, if you were writing to Nina Brown, you can leave the Ms/Miss off of her name if you are not sure what her marital status is. The salutation. This could be “Dear Ms Brown” or “Dear Nina Brown”. If you are not sure who is going to be reading the letter, use “Dear Sir, or Dear Madam”. You can also use “To Whom It May Concern”, but only as a last resort if you have no idea who your audience is. The body of the letter. We will focus more on this in the next section of the article. The closing of the letter, with a... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Dùng giấy viết thư có phần tiêu đề chuyên nghiệp. Mở chương trình xử lý văn bản. Cài đặt định dạng theo khối (block form).