Any advice on hunting song dogs in the timber?

There are coyotes everywhere around southern Oregon. I see there tracks and hear them howl. However I have never been able to call one in. I live just west of Crater Lake. On the other side of the lake there is some desert where I have had success.(a tank of gas away) However I can't seem to bag a timber dog. Are they smarter? I have even caught them with snares, but I really want to call them in. I know about wind and so forth. There is just not much open ground except power line trails and private property. Any advice would be appreciated.