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
fang yuan » wang yuhan, wang yan, meng yuan
yan hyun » yan kun, yan yuan, yang yun
yu chen » yu cheng, yi chen, yulu chen
yan yu » yun yu, yan yuan, yang yue

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 yu chen ((yan hyun) or (fang yuan)) kyoung yun ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: han zhang yan yu chen ((yan hyun) OR (fang yuan)) kyoung yun ;*.