E-mails, FTP accounts, and DBs will only be searched for when you're signed in to a user-level account. The search bar, currently at least, will not try to look up user accounts by comparing what you are entering to the e-mail addresses that have been listed for a user account. It will compare what you're entering against usernames, domain names, as well page names within DA itself.
Perhaps those options should be greyed out in the search options when logged in to an admin/reseller account to indicate they won't work?
On a similar note, the search settings should be very different for actual reseller and user accounts. Currently a user still sees the same search options as an admin. It should likely only display E-mails, FTP Accounts, and DB Entries. Not sure if Domains should be listed there as a way to quickly switch between domains in a user account with a myriad of domain names within it.
Lastly, when signing in to a user account as an admin, the search bar seems to still try to look up admin/reseller pages until either timing out or caching the result of no results. Either way, I wind up with a loading circle inside the results if I enter "admin" or "reseller" for some time. Eventually it will turn into "no results" and then subsequent attempts will quickly show "no results"