Search engine companies collect the database information and histories of the users from search queries. These search information are useful for the researchers. Search engine companies are publishing different search information in order not to release sensitive information of the users. In this paper, the author analyze algorithms for publishing relevant keywords, queries, and clicks of search information. The author have to show how methods that achieve difference of k-anonymity are vulnerable to active attacks. They then demonstrate that the stronger guarantee ensured by e-differential secured unfortunately does not provide any utility for this issue.