CNKI (China National Knowledge Infrastructure) is the largest academic knowledge infrastructure in China and the largest academic resource library in China, providing a large number of academic papers, periodicals, conference papers and other resources. In order to retrieve the required information more effectively, the following are some commonly used HowNet retrieval methods:

1.** Keyword retrieval * *: This is the most basic retrieval method. Enter keywords in the search box, and all documents related to these keywords will be returned.

2.** Advanced Search * *: Click the "Advanced Search" button on the right side of the search box to enter the advanced search interface. Here, users can choose a variety of search criteria, such as author, unit, publication year, etc. , narrow the search scope.

3.** Professional Search * *: For users who are familiar with the search language, you can use the professional search function. By writing search formulas, we can locate the required documents more accurately.

4.** Classification browsing * *: HowNet provides a variety of classification systems, such as subject classification and periodical classification. Users can choose the corresponding category to browse according to their own needs.

5.** Citation search * *: You can find other important documents related to a certain document by looking at the cited times and cited documents.

6.** Author Search * *: Enter the name of the author or organization to find all documents published by the author or organization.

7.** Fund project search * *: If you know the name or serial number of a research project, you can find all the documents funded by this project through fund project search.