You can go to the Global Information Website of the National Library of Taiwan Province Province (search for the keyword "Central Library") in the "Doctoral and Master's Thesis System of Taiwan Province Province", enter keywords and search. If you find a paper, look for the word "electronic full text". If yes, it means that the author authorized the website to publish electronic documents. At this point, click to download the electronic document of this paper. If the word "electronic full text" cannot be found, it means that the author is not authorized to download it. You must join the membership before downloading, and the membership is free.