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From: Gregory Heytings via "Emacs development discussions." <emacs-devel@gnu.org>
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Subject: Re: Suggest installing more fonts?
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Cc: Eli Zaretskii <eliz@gnu.org>, emacs-devel@gnu.org
To: Lars Ingebrigtsen <larsi@gnus.org>
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>> I don't understand this, "apt-cache search <script> font" or "apt 
>> search <script> font" work for (almost?) every <script>, including 
>> tagbanwa, sinhala, lepcha, bhaiksuki... which I'd never heard about.
>
> larsi@xo:~/src/emacs/trunk$ apt-cache search vietnamese | grep font
> fonts-pecita - OpenType hand-written font whose letters are connected
> emacs-intl-fonts - fonts to allow multilingual PostScript printing from Emacs
> xfonts-intl-asian - international fonts for X - (south-east) Asian
> fonts-texgyre - OpenType fonts based on URW Fonts
> fonts-ibm-plex - extensive typeface family designed by IBM
>
> None of these are actually the package you'd want to install.
>

I don't know, I don't read/write vietnamese.  But I don't understand why 
you write that "none of these are the package you'd want to install", 
fonts-ibm-plex seems a good candidate.  And from what I see in HELLO, 
Vietnamese uses the latin script, with added diacritics, so I guess 
there's in fact no need to install additional fonts to read/write 
Vietnamese.  Viet is something else, it uses the tai-viet script, and:

$ apt-cache search viet font
fonts-pecita - OpenType hand-written font whose letters are connected
emacs-intl-fonts - fonts to allow multilingual PostScript printing from Emacs
xfonts-intl-asian - international fonts for X - (south-east) Asian
fonts-texgyre - OpenType fonts based on URW Fonts
fonts-noto-core - "No Tofu" font families with large Unicode coverage (core)
fonts-sil-taiheritagepro - typeface reflecting the traditional hand-written style of the Tai Viet script
texlive-lang-other - TeX Live: Other languages
fonts-ibm-plex - extensive typeface family designed by IBM

in which you find fonts-noto-core.