If this search term does not work, what hope is there for other manufacturers. It highlights the importance of your own website/blog with good SEO, and not to rely too much on social media.

It appears from the FB help on search:

Facebook search results are based on your Facebook activity. Facebook search results aren't influenced by activity off Facebook.

In the past this was not the case and the sitewide search was quite good. Alas now it is a total waste of time.