I try to draw Data Flow Diagram (DFD) by Enteprise Architect (EA). I am using Vietnamese, but Enterprise Architect only display true unicode at first time, then display error. If you using EA, let's try some unicode text: "Sinh viên", "Quản trị hệ thống", "Kho đồ án" etc.. and figure out how to type unicode font and display, print these text true.

Thank you!
(I have been read this , but answer doesn't figure out real solution, although the answer maked accepted)
I use EA 10.x, your text is ok for storing in EA. But, before add unicode symbols to your model you should perform following:
or in details follow this instruction: http://www.sparxsystems.com/enterprise_architect_user_guide/9.3/projects_and_teams/check_in_languages_other_than_.html