[Tip] how to add relative post to your blog?

It's look like so many ways to add relative widget to your blog post, this is so simple way use feed blogspot to show the similar post in one label, how to do that let's start step to step:
Note: remember backup your template already before do that:

1. Go To Blogger > Template
2. Backup your template
3. Click "Edit HTML"
4. Just paste down below </head> tag this code:

Copy
<script type='text/javascript'>
//<![CDATA[
var titles=new Array();var titlesNum=0;var urls=new Array();var time=new Array();function related_results_labels(c){for(var b=0;b<c.feed.entry.length;b++){var d=c.feed.entry[b];titles[titlesNum]=d.title.$t;for(var a=0;a<d.link.length;a++){if(d.link[a].rel=="alternate"){urls[titlesNum]=d.link[a].href;time[titlesNum]=d.published.$t;titlesNum++;break}}}}function removeRelatedDuplicates(){var b=new Array(0);var c=new Array(0);e=new Array(0);for(var a=0;a<urls.length;a++){if(!contains(b,urls[a])){b.length+=1;b[b.length-1]=urls[a];c.length+=1;c[c.length-1]=titles[a];e.length+=1;e[e.length-1]=time[a]}}titles=c;urls=b;time=e}function contains(b,d){for(var c=0;c<b.length;c++){if(b[c]==d){return true}}return false}function printRelatedLabels(a){var y=a.indexOf('?m=0');if(y!=-1){a=a.replace(/\?m=0/g,'')}for(var b=0;b<urls.length;b++){if(urls[b]==a){urls.splice(b,1);titles.splice(b,1);time.splice(b,1)}}var c=Math.floor((titles.length-1)*Math.random());var b=0;document.write("<ul>");if(titles.length==0){document.write("<li>Không có bài viết liên quan</li>")}else{while(b<titles.length&&b<20&&b<maxresults){if(y!=-1){urls[c]=urls[c]+'?m=0'}document.write('<li><i class="fa fa-angle-right" aria-hidden="true"></i>  <a href="'+urls[c]+'" title="'+time[c].substring(8,10)+"/"+time[c].substring(5,7)+"/"+time[c].substring(0,4)+'">'+titles[c]+"</a></li>");if(c<titles.length-1){c++}else{c=0}b++}}document.write("</ul>");urls.splice(0,urls.length);titles.splice(0,titles.length)};
//]]>
</script>
</b:if> code-box

find
post-footer or post-footer-line post-footer-line-1 code-box
paste bellow code to show relative news
<div class='relative-post'>
     <h4>May you like this post:</h4>
        <b:loop values='data:post.labels' var='label'>
            <script expr:src='&quot;/feeds/posts/default/-/&quot; + data:label.name + &quot;?alt=json-in-script&amp;callback=related_results_labels&quot;' type='text/javascript'/>
        </b:loop>
        <script type='text/javascript'>var maxresults=5;removeRelatedDuplicates();printRelatedLabels(&#39;<data:post.url/>&#39;);</script>
    </div> code-box
add CSS :
    .relative-post ul{
        margin-bottom: 1rem;
       list-style: none;
        padding-left: 0px;
    } code-box
So easy to do right? Save your template and check the result.