基金Acknowledgements： The author would firstly like to thank Associate Professor, Dr. Vo Van Nhi and Associate Professor, Dr. Mai Minh for their guidance, encouragement, and good advice. This article is a much better work thanks to their assistance. The author＇s thanks must also go to the university as well as the faculty for allowing spare time for doing this survey and writing reports. They also give the author opportunity to examine many games that might otherwise have never been encountered. Finally, the author would like to thank all members of the family and friends for all their invaluable supports.