How to setup search site collection with synopses

Question

Dear Team,

 

How to configure to search site collections by keywords or synopses?

 

For example, assume  https://test.sharepoint.com/sites/Test/  my site collection URL . I want to set a keyword for this site "Test" when people search with Test it should display my site collection URL 

 

Please note that we are using SharePoint Online  

 

Best regards