Oral and maxillofacial surgery is surgery to correct a wide spectrum of diseases, injuries and defects in the head, neck, face, jaws and the hard and soft tissues of the oral and maxillofacial region. It is a recognized international surgical specialty.
This kind of surgery should be very rare. As in not many people need it. So your chance of getting a recommendation is low low low..
Wikipedia did mention these few countries.. U.S.A., Canada, Australia, and New Zealand. And not Korea and Taiwan. You can give a shot there?
Try this link. it contains links to certain Korea Hospitals.. http://eng.kaomfr.org/m5/m5_1.htm
Care to explain what Maxillofacial Surgery is?