It is better to teach people to fish than to teach people to fish! Egg roll is a student of the International Trade Department of a university. I'm glad to help you. In fact, there is a good way for you to get such a certificate quickly. We usually use this method to find Chinese and English documents and papers. Go to google and ask for the name of the work you want or add it. Pdf to it, such as "business technology.pdf" or "business technology.doc". What documents or certificates are you looking for? This method works well with keyword+. Pdf or+. Doc, egg roll You can find more papers, look at the structure of the papers and the author's ideas, and refer to them appropriately. Egg rolls remind you of the problems you should pay attention to when using this method: 1. Google must be used, because only google has a powerful pdf file retrieval function, Baidu effect will be biased. 2. Pay attention to keywords. If a keyword can't find a suitable paper, it is suggested to try a few keywords, and you can definitely get the paper. 3. Try to find papers from the lower part of the first page of the search page. Because google also has a search ranking, some paper websites will rank ahead of the information you retrieve, and generally need to register or pay for downloading. Generally, clicking on the link directly will lead to a downloaded page, and it starts from the back of the first page of the search page. 4. Try more, there must be. Believe in omelets. 5. Also recommend Sina's network interactive hard disk, which contains information uploaded by many people. Direct keyword search, you will find more results, and then find those (many) that don't need to download points, and you don't need to register! Sina Interactive Website:/