Problems with Formula Don't give me anything.

I have a Choice field With DateR1,  DateR2...... to R5

What I need,  Find all documents by DateRx  that al delayed with respect to the CutOff date and not have Earned Value.

On the View Table I have this Formula 

let myFrom := 'From Date';
let myTo := 'CutOff';
switch number(Dates) do
case 1:
    (select DOCUMENTS where 'EarnedValue' = null and DateR1 >= myFrom and DateR1 <= myTo)
case 2:
    (select DOCUMENTS where 'EarnedValue' = null and DateR2 >= myFrom and DateR2 <= myTo)
case 3:
    (select DOCUMENTS where 'EarnedValue' = null and DareR3 >= myFrom and DateR3 <= myTo)
case 4:
    (select DOCUMENTS where 'EarnedValue' = null and DateR4 >= myFrom and DateR4 <= myTo)
case 5:
    (select DOCUMENTS where 'EarnedValue' = null and DateR5 >= myFrom and DateR5 <= myTo)
end

The Formula don't work