Steps to reproduce:

1. Create a new dashboard (or another entity where is field "owner", for example scheduled reports)
2. Observe that the owner field is "Admin (Zabbix Administrator)"
3. Remove "Admin (Zabbix Administrator)" from the owner field
4. Type to search "Admin (Zabbix Administrator)" or "Zabbix Administrator"

Result:
No matches found. Only one user object can be searched: by alias, or by name, or by surname. It is not possible to search by "name surname" or the whole combination of user parts "Admin (Zabbix Administrator)" , as we see when creating new dashboard.
Expected:
Search by "alias and name and surname" together