flomei

Sometimes you want to point your visitors/readers on other posts covering a specific topic.
You can either have this coded the hard way in your theme or use a plugin which will always show related articles, but what if you only want this to happen sometimes?
This plugin gives you a shortcode to insert in posts where you want to display a number of related posts. They will be shown with headline and date (optional) and can be styled via CSS.
<h3>Donations</h3>
If you find this plugin to be very useful it would be really kind if you donate a few bucks via PayPal (zahlungen@flomei.de).
Otherwise I really appreciate if you simply spread the word about this plugin or link back to www.flomei.de. 🙂

Show articles by keyword

This plugin adds a shortcode so you can show related articles based on a keyword with no effort.

conis

This plugin can high light keyword after someone searchecd it, which supports the search engines like google, baidu, ask, yahoo&bing. 
1.the highlight words are from the link of the search engine 
2.every key word is added with a link, clicking the link can search in the site 
3.on the top of the article show the key words which users are searching 
4.high light the searching result 
5.the highlight words are showed in the content and the excerpt
more information, pls visit(English):<a href="http://conis.cn/1365/" rel="nofollow ugc">http://conis.cn/1365/</a> 
国内的朋友请访问我的博客获取更的信息 <a href="http://conis.cn/1344/" rel="nofollow ugc">http://conis.cn/1344/</a>

wp-markKeyword

This plugin can high light keyword after someone searchecd it, which supports the search engines like google, baidu, ask, yahoo&bing.

Show articles by keyword vs wp-markKeyword