At present, the well-known papers download websites in China must be China HowNet and Wanfang. The document you want should be complete. As we all know, searching is free, but downloading is paid. But there are ways.

I know there are three ways to download papers for free:

1. Log on to these fee-paying websites in the library or university campus for information, because most of these institutions have subscribed to their services, and you only need to pay the internet fee.

2. If you don't have the above conditions, you can search on Taobao. Some sellers are engaged in this business, choose the one that suits them, contact them online, download them and send them to you online, which is very fast. You can try searching the "small T database", which seems to be 0.05 yuan a piece.

3. Just find a forum to publish this kind of account and query information through the free account it provides. However, I feel that information screening is more troublesome, and it seems to be changed frequently, which is more troublesome.