Advanced search commands
1. Double quotation marks (""): indicates a full match.
2. minus sign (-): indicates that the search page does not contain the word after the minus sign.
3. asterisk (*): It is a wildcard, but Baidu does not support the * SEARCH Command.
4. inurl: The page used to search for the words that appear in the URL.
5. inanchor: The result returned by the command is the page containing the search term in the text of the import link anchor. Not supported by Baidu.
6. intitle: The command returns a page containing keywords in the page title.
7. allintitle: The search returns a file containing multiple groups of keywords in the page title. Separated by spaces.
8. allinurl: return the page in the URL displayed in the search phrase, similar to the above.
9. filetype: used to search for a specific file format. For example: filetype: pdf seo: All PDF files containing the keyword Seo are returned. Baidu only supports: PDF, Doc, xls, PPT, RTF, and all. All indicates all file types supported by Baidu.
10. Site: it is the most familiar Advanced Search instruction for Seo. It is used to search all files indexed by search engines under a domain name.
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