Category Wise Search
Category Wise Search Widget plugin.You have option search specific category content.
Plugin Tag: search by category
Product Category Dropdowns
Displays product categories as dependent drop-down selects.
Swiftype Site Search Plugin for WordPress
Fast, intelligent, and fully customizable search for your site.
Hierarchy Product Category Drop Down
Show hierarchy dropdown to search woocommerce products per category.
Advance Ajax Live Search
Search By Author-Tag-Cats-Date And Keyword.
Keyspider Site Search Plugin for WordPress
Relevant, intelligent, and fully customizable site search for your WordPress website.