Article in English: One of the most efficient ways of improving your reading speed is to preview the material before you read it. This can help you to get a sense of what the text is about and allow you decide if it's even worth reading in full.  To preview the material, try reading the entire first paragraph, the first sentence of each successive paragraph and the entire last paragraph. In between these items, look at headings, bullet points and highlighted words. This won't give you all the details, but it will help you to identify the most important parts to go back to and what you can simply skim over. This is a good technique for long, unfamiliar or difficult texts which you are trying to get an initial grasp of. Another technique is to simply scan the material and pick out any key words. By using this method, you can develop a basic understanding of the material without wasting time on the nitty gritty. For example, in the sentence "the fearsome lion stealthily hunted its unsuspecting prey -- the antelope," it is not necessary to read every single word in order to grasp its meaning. By skimming the text for key words you can come up with the phrase "lion - hunted - antelope", which communicates essentially the same meaning. following this step allows you to halve the time it takes to read a text without sacrificing too much meaning. This technique is best used for simple, short texts, such as magazine and newspaper articles. If you're reading an article, book or paper for the sole purpose of gleaning new information, then a handy technique is just to read the first and last sentence of each paragraph, especially when it's reiterating something you already know.  A lot of non-fiction work can be very repetitive and contain long-winded explanations of a simple concept. If you already have a grasp of the concept, then there's no need to go through the entire paragraph line by line. This also goes for newspaper and magazine articles -- if you only want a basic overview of the contents, it's amazing how much information you can...

Summary in Vietnamese:
Xem trước tài liệu. Tìm ra những từ quan trọng nhất. Đọc câu đầu tiên và câu kết thúc của mỗi đoạn văn. Bỏ qua những phần bạn đã biết. Ghi nhớ những thông tin quan trọng nhất.