Sina microdisk: Sina microdisk is a cloud storage network disk and the official network disk of Sina Weibo. It can be used to store files and share files with friends in Weibo. Support computers, mobile phones and other multi-terminal access, simple and easy to use. Support computers and mobile devices, can automatically synchronize and back up data, support web access, upload and download data anytime and anywhere.
Baidu's convenient search method: when looking for a certain type of file e-book, such as pdf format, you can enter the file type in the search box: pdf XXX (XXX stands for file name), which is easy to find.
The most commonly used search engines are Google and Baidu, others are Tencent's Soso, Sohu's sogou, Netease's Youdao and so on. Google has a special book search. Google Books can search the latest book index in the world and provide previews or free reading of millions of good books.
If some foreign language books are hard to get, you can try Google Books. Maybe the chapters previewed for free will have what you need. However, Google Book Search generally does not provide links to book download addresses, and some experts can try to download some software to help. Search in Google engine, and you can also specify the format of e-book files.
When searching, just add "filetype:pdf" after keywords, and support common file types such as PDF, doc, rtf, txt, rar and zip.
The advantage of searching e-books with search engines is that you can get more comprehensive information, but the disadvantage is that there is too much information to search, so you need to find the books you need and their links from a lot of information. You can save time by adding keywords or using some advanced search skills of search engines to filter information.