Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
chen zheng » chen zhen, chen aizheng, cheng zhang
wang yang » wang yan, wang liang, wang yanling
cheng han » chen hao
guang zi » guang zhe, guan li, guang eu
xin song » jin song, xin tong, ein sog
kim song » kim young, kim eung

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang guang zi ((chen zheng) OR (cheng han)) ((xin song) OR (kim song)) (shin OR sein) ;~.
• Adding a wildcard symbol may retrieve word variants: wang yang guang zi ((chen zheng) or (cheng han)) ((xin song) or (kim song)) (shin or sein) ;*.