Add a Google Sitemap to Blogger Blog
  1. Open the Sitemap Generator and type the full address of your blogspot blog (or your self-hosted Blogger blog).
  2. Click the Create Sitemap button and this tool will instantly generate the necessary text for your sitemap. Copy the entire generated text to your clipboard (see screenshot below).
  3. Next go to your Blogger dashboard and under Settings – > Search Preferences, the enable Custom robots.txt option (available in the Crawling and Indexing section). Paste the clipboard text here and save your changes.
Tool: (XML Sitemap for Blogger)

Where is Blogger Blog's Sitemap?
Blogger created a sitemap for your blogspot at this URL:
You can download this sitemap to regist to search engines.

Add META tag "description" for Blogspot through Blogger Management
Blog Manage Page => "Settings" => "Search Preferences" => META Tag => "Edit"
For example: "Vietnam IT Outsourcing, Web making"

Add META tags for Blogspot
META tags:
<meta content='DESCRIPTION HERE' name='description'/>
<meta content='KEYWORDS HERE' name='keywords'/>
<meta content='AUTHOR NAME HERE' name='author'/>
Where to add:
Blogger Management => Template => Edit HTML:
Add META tags RIGHT AFTER this line:
<b:include data='blog' name='all-head-content'/>
Will look like this:
    <meta content='IE=EmulateIE7' http-equiv='X-UA-Compatible'/>
    <b:if cond='data:blog.isMobile'>
      <meta content='width=device-width,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0' name='viewport'/>
      <meta content='width=1100' name='viewport'/>
    <b:include data='blog' name='all-head-content'/>
    <meta content='XXX' name='description'/>
    <meta content='YYY' name='keywords'/>
    <meta content='ZZZ' name='author'/>

Change Geographic Target for Blogger Blogspot
Improve search result for targetted country.
Google Webmaster Tools Home => Site configuration => Settings => Geographic target