mokorana

This extension adds an additional “Product SKU” search filter to your WooCommerce Orders page. 
It allows searching orders by product SKU as well as variation SKU, making it easier to locate orders tied to specific variations.
Supports both HPOS (High-Performance Order Storage) and Legacy order tables.

Mokorana Orders SKU Search

A WooCommerce extension that allows you to search orders by Product SKU and Variation SKU in the Admin Panel.

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

Mokorana Orders SKU Search vs Search by SKU for Woocommerce