Mult Parameter Help

I am working on a report for a client and in the parameter field they would like to be able to use different date ranges if needed. The fields they would like to have parameters for would be Effective Date, Tracking Date, ReCred Letter Sent Date, ReCred Complete Date. Instead of making 4 different reports, I was looking for something I can put in my statement so she can pull either fields.

This is what I thought would work. I am using Microsoft Visual studio. If you think it is better for me to put it in my actual SQL I can do that too.

Here is what I was doing below. The when I try and run the report, it tells me that I need to have a value in each one of my parameters. Can this type of formula work or do I need to have 4 separate reports.

([Tracking Thru Date] >= @trackfrom) AND ([Tracking Thru Date] <= @trackthru) or
([Effective Date] >= @efffrom) AND ([Effective Date] <= @effthru)or
([ReCred Letter Sent Date] >= @sentfrom) AND ([ReCred Letter Sent Date] <= @sentthru) or
([ReCred Complete Date] >= @compfrom) AND ([ReCred Complete Date] <= @thru)

Thanks!