1. Why does Vietnamese typing in VinaCAD show errors and display “?” characters?

Common cause:
VinaCAD is using a font that does not support Vietnamese diacritics, especially .SHX fonts or non-Unicode .TTF fonts.

Recommended fonts (Unicode – display Vietnamese well):

1. .TTF fonts (standard Windows Unicode):

Arial / Arial Unicode MS
Calibri
Tahoma
Times New Roman
Segoe UI
Verdana
Roboto
Noto Sans / Noto Serif (full Unicode – excellent display)

2. .SHX fonts:
Most default AutoCAD/VinaCAD SHX fonts do not support Vietnamese diacritics → using SHX easily causes diacritic errors and “?” characters.

2. How to fix Vietnamese typing errors in VinaCAD

Step 1: Enter the STYLE command

Step 2: Select the style used by the text with errors

Step 3: Change the Font Name → select Arial or any font that supports Vietnamese as listed above

Step 4: Click Apply → Close → Type Vietnamese text to check again

3. How do I add a new font to VinaCAD?

If you want to use external Unicode fonts (Roboto, Noto Sans, Vietnamese-localized fonts…), you can add them yourself.

Step 1: Enter the ALLTEXTPROP command to open the font management interface.

Step 2: Add a new font

In the interface:

Select Add new font
Click the Browse button
Select the path to the .TTF font file you want to add
Click Open → The font is added to the system
You can then use the new font immediately in the STYLE or MTEXT command.

4. Which fonts should I use to avoid errors when sharing drawings?

For maximum compatibility, you should use:

Arial
Tahoma
Roboto
Noto Sans

These fonts are common, easy to read, support Vietnamese, and prevent errors when sending files to others.

Full video guide: Fixing Vietnamese text errors + Adding fonts to VinaCAD

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