How to reproduce:
Thank you for reporting this problem, I will investigate.
I've realised the issue is not the characters but the number of characters entered. beorg only performs the search is 3 or more characters are entered. This minimum length isn't helpful for languages such as Chinese. What I'm going to do is add a setting so a user can change this. The reason for the setting is performance when searching using the UI. You'll see this new setting in the next update.