The following are some reliable ones for your reference: 1. Google academic search (scholar. Google/)- provides search services for academic research papers and publications. 2. Wikipedia (Wikipedia. org/)- provides information on various topics, with wonderful content, edited by professionals. 3.doc88/)- Provide research in various fields. 4. sogou College (sogou/sogou? PID = sogou-site-8db1b78440b104ee)-provides search services for academic documents and publications. 5.Google/)- a search engine that provides general information. 6. Baidu Academic (xueshu. Baidu/)- provides search services for academic research papers and publications. 7. Ministry of Education of People's Republic of China (PRC) (moe. gov. cn/)- provides information and policies in various fields of education. In a word, users should judge the reliability by themselves and verify it when using any or tools for search and research.