How to manage the result of LOV?

Hi,
I’m working on database oracle 10g and form developer 6i.
I have LOV returns the first name and the last name of the employees.If I press f9 and write the first letter (S for example)it brings the employees whoes first name begin with S, what i want is that after writting the first letter i want to put space and write another letter (W) in this case it should brings the employees whose first name begin with S and last name begin with S.
Regards