Hi Gavin,
I assume you mean singular/plural keyword difference in this case? (laptop/laptops)
If the keyword “laptops” is not within the selected fields, then it’s not matching for that reason. In the upcoming release there will be an automated singularization/pluralization feature for the English language, it’s under testing.
Currently it is still possible via a bit of custom code from this knowledge base. If you want I can set it up for you, all I need is temporary back-end and possibly FTP access.