Encoding Selection:
It is necessary to select an encoding Unicode(UTF-8) scheme which includes the Vietnamese Unicode character range.
First, click the mouse on View .

Second, click the mouse on Encoding. Third, click the mouse on Unicode (UTF-8) and deselect Auto-Select. Deselecting Auto-Select assures that Internet Explorer will use Unicode encoding each time the program is reloaded.

Finally, click the mouse on Refresh to activate the new settings.

After Internet Explorer has a Unicode compatible font, and the Encoding is set to Unicode, Vietnamese character should display properly.