I'm trying to show combinations of my data on a query called Sales by using a form and 3 combo boxes. But when there are no combinations I want the form to show a message saying no combinations found.

I was told I should look up what RECORDSET is otherwise I wouldn't get it. So I didn't but I'm still not getting anywhere. I'm new to this but willing to learn.
Combo boxes:
companycell, companyflux, companyribbon
...