I am trying to build a Parameterized View, but I want to do a substring search with 3 parameters.

If cUsrFirstChoice = 'Toolkit', then this works:

where ?cUsrFirstChoice $ cTitle

But if cUsrFirstChoice = 'Toolkit' and cUsrSecondChoice = ''
then this returns no records:

where ?cUsrFirstChoice $ cTitle
and ?cUsrSecondChoice $ Subtitle

I was dinkering with macro expansion and the '%' but am coming up dry. Help?!