1. Sample books of Douyin can be found on Douyin.

2. Because Douyin is a popular social media platform, many businesses and individuals have opened stores on it to sell various products, including sample books. Stores on Douyin will display their products and provide purchase links or contact information.

3. In addition to Douyin, you can also look for sample books of Douyin on other e-commerce platforms or book websites. These platforms usually have special book categories, and you can enter keywords such as "Douyin sample books" in the search box to find related products. In addition, you can also follow some public accounts or bloggers who recommend books. They often share recommendations and purchase links for some good books.