Custom value search in userDB back to profile for adminCP like (Quick Email Finder)

[Skyrider]

I was wondering if there's an easy way for me to add a code into the admin_index_xx hook to search inside a specific field and result to the users profile in admincp? Much like the Quick Email Finder, but rather than the email, searching another field inside the user table. I attempted to replicate the code of Quick Email Finder and try to make it work, but thus far not working.

Not referring specific which field, as I have multiple fields in mind in the end. I was just hoping someone could push me into the right direction. For what it's worth, these fields inside the user table is not default from a vB installation.

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For those who are confused. I merely wish to create a custom MySQL field search, in a specific table resulting in the username as a result from the AdminCP. Exactly like the Quick Email Finder, or the username finder, etc.