I tried your scenario using QWP 5.7 for SP2010 and it worked for me using the following syntax:
a. Custom field of type Text called CountryID
b. Custom field of type Number called SecID
c. Custom field of type Text called Country ID2
Don't replace the space neither add parenthesis to the field name. Use parenthesis only if you have multiple conditions in the complex filter.
What's your QWP and SP version?