In addition to normal search, if you want to search a channel user with additional search keys then make use of “Expand Search” Option, located near the drop-down list of the search column.
When you click on “Expand Search” Option, some additional search keys appear that facilitate you to select the channel level, status of channel user and date at which the user is created or in last few days how many user has been created.
After selecting the search keys, click on “Search” button to search the user you are looking for.
After you click on “Search” Option, the system will display you the particular user whose details goes well with your search keys.