Search problem

Hi, I have OC 2.3.0.1 and Ajax search module "Live Ajax Search 6.1.0" who works fine.
But OC core search is apparently on the exact term, I Explain. Go to the website : https://www.vente-pieces-agricoles.com
At the top right, in search module, enter "AM60439", you have one product.
If you enter "AM6043" (without 9) you have 5 products in list, and now press "Enter". On the search page we don't have any product.
Question: How can I do to have also products when SKU or product name is not whole?
Thank you for help, it's a very important problem, customers does not understand this difference in search results.

Use this module
https://www.opencart.com/index.php?rout ... n_id=22288

It's works, thank you very much !