Problem with foreign language

[loctran016]

• I confirm that this is an issue rather than a question.

Bug report

Steps to reproduce

I've found that write something in Vietnamese, for example: 'Dặn dò" (Notice in en), it may look weird with the word has 2 syntaxs ( I don't know how to write that in english). For example, the issue will occur only Dặn but not dò.
Here is my

• I prepared a reproduction repo, here is the reproduction repo:

GitHub

• My blog
• My source code

GitLab (I've fixed that by changing the title but the content still have a small problem)

• My blog
• My source code

What is expected?

Good title

What is actually happening?

Look weird

Other relevant information

I've found out that lot's of fonts may conflict with Vietnamese words somehow. Do you think that this is a problem with the font then?
Here is my picture from the github site: