There isn’t a way to do the search that you are looking for, at least not easily.
Normally when searching by post title and a meta query this is “AND” meaning that both the title AND the meta value must contain what you are searching for.
There isn’t an easy way to do a search where the “post_title” OR the “meta_key” matches. Honestly, I haven’t a clue how to do this.
What I would do is I would be to copy the post title to a meta value using an acf/save_post action. Then you can that meta key for searching. As far as breaking down the search string into words, I don’t know how to do that.
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