Media tags and searching special characters

Loaded my media and I am trying to figure out how to handle special foreign language characters.

Simple example, Tiesto and Tiësto

If I search Tiesto I find 4 tracks, but if I browse to Tiësto, the rest of my media is there.

As a test, I tried logitech media server and even airsonic. In both cases, searching Tiesto returned all tracks including Tiësto.

Is this something I can easily resolve within volumio or am I required to re-tag all of my media?