--- a/browser/locales/search/list.json
+++ b/browser/locales/search/list.json
@@ -717,17 +717,17 @@
         "visibleDefaultEngines": [
           "google", "yahoo", "bing", "amazondotcom", "ddg", "twitter", "wikipedia-uz"
         ]
       }
     },
     "vi": {
       "default": {
         "visibleDefaultEngines": [
-          "google", "ddg", "wikipedia-vi", "zing-mp3"
+          "google", "coccoc", "ddg", "wikipedia-vi", "zing-mp3"
         ]
       }
     },
     "wo": {
       "default": {
         "visibleDefaultEngines": [
           "google", "yahoo", "bing", "amazondotcom", "ddg", "wikipedia-wo"
         ]

new file mode 100644
--- /dev/null
+++ b/browser/locales/searchplugins/coccoc.xml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+
+<SearchPlugin xmlns="http://www.mozilla.org/2006/browser/search/">
+<ShortName>Cốc Cốc</ShortName>
+<Description>Use Cốc Cốc to search on coccoc.com</Description>
+<InputEncoding>UTF-8</InputEncoding>
+<Image width="16" 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+<Url type="application/x-suggestions+json" method="GET"
+     template="https://coccoc.com/composer/autocomplete">
+  <Param name="of"  value="b" />
+  <Param name="q" value="{searchTerms}"/>
+  <Param name="s" value="ff"/>
+</Url>
+<Url type="text/html" method="GET" template="https://coccoc.com/search" resultdomain="coccoc.com">
+  <Param name="query" value="{searchTerms}"/>
+  <Param name="s" value="ff"/>
+  <Param name="utm_source" value="firefox"/>
+</Url>
+</SearchPlugin>