Not working when using search string with spaces

Hi,

When searching an SKU such as PQI 115, no results are found. Partial search (PQI or 115, for instance) does return results. I’m using woocommerce 2.2.6. Can you advise on this, please?

Thank you.
JM

https://wordpress.org/plugins/search-by-sku-for-woocommerce/