I can't change the club name (Vietnamese)

Hello.
In Vietnamese in our country, there will be words that use punctuation marks such as `, ~,....
Some words illustrate the punctuation that I mentioned: The word "ngã" uses the sign "~", the word "kẹo" uses the sign ".", the word "còi" uses the sign "`",...

But recently on Chesscom I cannot change the club name if the name has accented Vietnamese vowel letters (Â Ê Ô Á À Ã Í,....) However, the website still accepts the letters: (Ấ, Ở, Ổ, Ữ, Ắ,,,,)

For example: If I add that character and save the changes, the website won't let me save and automatically the "Í" or "í" will change to "Í" or "í"

Here is a list of Vietnamese letters I can't use to change the club name:

Â Ê Ô Á À Ã Í Ì Ú Ù É È Ó Ò Õ

You can try if you want.

(I use google translate, sorry if the grammar is wrong.)

Oh..

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chào bạn