In the latest version I implemented selectable search logic, which is exactly for solving these kind of issues.
Here is an explanation on them: https://wp-dreams.com/knowledge-base/search-logic-explained/
In your case I would suggest to select the “AND” search logic on the General Options->Behavior tab. This way the search will look for partial matches, but every word must match the result.
So if the post title is “Canon PIXMA MX300” then the “Canon MX300” will definitely be a relevant match. For even more relevant matches you can choose the “AND with exact word matches” option.
Also, make sure to turn OFF the “Show exact matches only?” option on the General Options->Sources panel (at the bottom) if you change the search logic, as it will only match the exactly typed partial or full matches, which is not the desired way in most cases.Best,
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