ishihara takashi

Release.Is a powerful search plugin for WordPress users. Implements typeahead.js using a ingrimental search.
Start by pressing SHIFT key two times.
<h4>Featured</h4>
<ul>
<li>Admin Menu Search</li>
<li>Post Search</li>
<li>Page Search</li>
<li>Media Searchd</li>
<li>Cusotom Post Type Search</li>
<li>User Search</li>
<li>Select a color scheme</li>
<li>Select a trigger key</li>
<li>Starting from the admin bar</li>
</ul>
Github repo
https://github.com/1shiharaT/powearch/

Powearch

Release.Is a powerful search plugin for WordPress users.

mattsgarage

The search functionality in woocommerce doesn’t search by sku by default.
This simple plugin adds this functionality search facility of your site, in both the public site and admin panel
Just install and activate – no config required.
Tested with Woocommerce 1.5.6, 2.0.7, 2.0.18, 2.2.4, 2.2.10, 3.4.4, 4.0.1 and 4.2.0
See the <a href="http://www.mattyl.co.uk/2012/12/11/woocommerce-plugin-to-search-products-by-sku/" title="accompanying blog post" rel="nofollow ugc">Accompanying blog post</a> for more information.

Search by SKU for Woocommerce

Extend the search functionality of woocommerce to include searching of sku

Powearch vs Search by SKU for Woocommerce