Advanced integration with WC Vendors plugin. Search for vendor products, show vendor badge for each product search results, search for vendor stores, search inside vendor stores and limit results to only this vendor products.
Yes. Just use the search results filters feature. Create new filter for products search results and set it with following parameters:
Product -> not equal to -> Any product
Yes. Just create the new search results filter rule. Set it to following parameters:
WC Vendors: Product sold by -> equal to -> CHOOSE_YOUR_VENDOR
Yes, you can do this by using some custom code snippet. More details can be found here.
Download free version from wordpress.org repository.
Read about differences between free and pro versions here.