Global Search can search from all the modules and records and it will show all the matching results. This feature helps you to search entire database and give you the results instead while the standard search will only search record name.
How to Customize Global Search
Go to Menu > Settings >CRM Settings > Extension Pack> Global Search.
Select the module.
You can include and exclude certain fields from being searched.
In arrange section you can actually arrange in which order the search results will show up.