Perhaps you should try some spelling variations:
kyoung yun » young yun, kyoung yang, hyoung gun
han zhang » han chang, hao zhang, yan zhang
zhang yan » zhang fan, zhang jian, wang yan
hua chen » jui chen, yu chen, a chen
yan yuan » yan guan, fang yuan, nan yan
yan hua » tan hua, ya hua, wang hua
yan kun » yan guan

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

• Performing a fuzzy search may retrieve terms with similar spellings: han zhang yan hua chen ((yan kun) or (yan yuan)) kyoung yun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: han zhang yan hua chen ((yan kun) OR (yan yuan)) kyoung yun ;*.