In addition, some master's theses may not be published in public databases because they involve confidential or sensitive information, and are only used by relevant departments or institutions. Therefore, if you need to consult a specific master's thesis, you'd better confirm its university and degree-granting institution first, and then go to the corresponding database or library for inquiry.
In addition, it should be noted that even if the master's thesis has been uploaded to HowNet, some papers may need specific permissions to view and download. This usually involves the author setting up the right to use his own paper, such as setting up that it can only be viewed at school or paid for. Therefore, if you can't view or download the master's thesis when searching on HowNet, it may be due to the above reasons. At this time, you can try to inquire or consult the university or relevant institution where the author of the paper is located, or obtain the relevant information and materials of the required paper through other channels.