Two report parameter with or condition /either should be selected

It depends on how you've written logic in backend code

based on your explanation i think what you're looking is this

in the dataset filter tab use like

=Fields!YourField1.value                  =IIF(Len(Parameters!Parameter1.value) =0,Fields!YourField1.value,Parameters!Parameter1.value)
=Fields!YourField2.value                  =IIF(Len(Parameters!Parameter2.value) =0,Fields!YourField2.value,Parameters!Parameter2.value)

This will make sure the parameter will get bypassed for the case where parameter value is NULL and you'll get all values from the list back in output

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