Portal search function does not work properly

Document ID : KB000126275
Last Modified Date : 06/02/2019
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has a questions about Portal's search function. 
When searching by the title of each page, not everything can be hit. 
There are cases where it is hit and there are cases where it is not hit. 
○Warehouse API v1 
○Application Gallery 
○Code Library 
○List of Documents 
○Manage Password Policies 
○Pending Edit Application Requests 
○Pending Account Plan Requests 
☓Usage Reports 

wants to know clear search criteria.
Portal's search item searches for characters contained in the page.
However, titles for dashboard pages are specifically excluded from search.