Unicode displaying trouble in LO


Hi there,
I’m from Vietnam and my langue use UTF-8 unicode for some special chars.
Within Layout, the autocorrect function did transform some chars like this:
Õ --> Ơ ; È —> Č, etc…
(Only Arial Narrow font wasn’t changed)
When i used Text or Label to type, if it happens, i press Ctrl-Z and it solved.
But it always be in Autotexts or infomations from Sketchup model like Component’s Description.
I think if we can disable the spell-check and auto correct, my problem will be over.
So, can anyone help me, please?
Thanks a lot.
(sorry for my english) Here’s link to sketchucation topic, there’s an image of this problem.
Thanks again