Judy, do you ever look them in the eye when they are most interested in your attention? Talon likes the morning time, I take here into the bathroom, (she loves it there) I get down to her level and say the word or phrase over and over, She looks at me very intently. (Almost like she's thinking I'm an idiot!) And I feel like one too! I do this every day until I hear her try to mimick me. It works pretty well, except it took her about 1 year to say her name. (I guess she didn't like it!!)
Of course I started out with something very easy. A chicken sound and peekaboo, then good bird!
Maybe this will help, or maybe I am just lucky!