Yo Vinh,
Believe me when I say you won't feel a thing working unless you are able to brace the load of your back swing properly on the inside of your right foot and right side, (assuming you are a right handed golfer). If you are loaded correctly, your right knee stays flexed an stable throughout your backswing which should make you feel a little pinch or a little stress on the outside of your right hip. You should also feel the weight shift to the inside of your right foot and don't let the weight of your backswing shift to the outside of your right foot. Think of a right handed pitcher in baseball...He will load his right leg (keeps it flexed) on the whined up and it unflexes, or unwhinds, all by itself when he starts the throwing motion propelling his weight into his left side creating torque for power. In golf it relates to whining your backswing onto your flexed and very stable right leg, and as soon as you start the downswing, (whether with your arms or shoulders or legs), your right leg will whip your weight to the left side thus giving you enough time to deliver the club properly to the ball. Try it along with an arched back which means sticking your butt out more and sticking your chest out more. Also keep the weight on the front half of your feet and don't let your weight shift to the back of your feet (heels) throughout the swing. Good luck and start pounding it. If you have any doubts, next time you see a tournament on tv, pay attention to all the golfers right leg throughout the swing. they have it flexed and loaded through out the backswing.