Although your school bought Wanfang's resources, some resources may not be available, so there is no full-text link, so you can't download them.

Moreover, some of Wanfang's dissertations have no full text, and no one can download them.

But let's ask the librarian first. They should be able to solve this problem.

Otherwise, you can go to the academic forum for help. There are many such forums now. Such as Zero Garden and Pingping College.