Sometimes can't search Chinese file

[allonli]

For example, I have a file: "百度 APP AI.docx"
Searching for "APP AI" in the search box can be found, but after adding Chinese, you can't search for files. If you change "百度" in the file name to another Chinese word, can be searched.
It's amazing！When I was in use of Alfred often appear such problem, but it is ok to spotlight. Can someone explain?

Alfred v3 and v4 are tried, all have this problem.

Edited May 31, 2019 by allonli

[Andrew]

[being helped by email]