1. keyword search: this is the most basic and commonly used method. A large number of related papers can be found by inputting keywords related to the topic of the paper in the search engine. However, the disadvantage of this method is that a large number of irrelevant papers may be found and need to be screened.

2. Advanced search: Many search engines provide advanced search functions. By setting multiple search conditions, you can accurately find the papers you need. For example, you can set the publication year, author, journal and other information of the paper.

3. Academic database search: Academic database is a professional platform for collecting and storing academic papers, such as IEEEXplore, ACMDigitalLibrary, SpringerLink, etc. These databases usually provide powerful search functions and can easily find the required papers.

4. Citation search: If you have found a paper related to the topic of the paper, you can find more related papers by looking at the list of references in this paper. This method is helpful to find the latest research results.

5. Social network search: Many researchers will share their research results on social networks, such as ResearchGate and Academia.edu. By searching on these websites, you can find some papers that are not included in the traditional database.

6. Professional forums and blogs: Some professional forums and blogs will also publish some high-quality papers, such as arXiv and CSDN. Papers in these places are usually peer-reviewed and of high quality.

7. Manual screening: If the above methods fail to find satisfactory papers, manual screening may be needed. This requires reading a large number of papers and picking out the most relevant parts of the research topic. Although this method takes time, it can find the most valuable papers.