Perhaps you should try some spelling variations:
chen yugang » chen huigang, chen yang, chen yulan
yang yang » wang yang
myung won » kyung woo, myung koo, seung won
yan yuan » fang yuan, nan yan, yan clan
yan guan » gan guan, yang guang, yihan guan
bo myung » bo kyung, je myung
yin yun » yin yin, yang yun, yin yang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((yang yang) or (wang yan)) ((yin yun) or (((yan yuan) OR (yan guan)))) chen yugang bo myung won ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((yang yang) OR (wang yan)) ((yin yun) OR (((yan yuan) OR (yan guan)))) chen yugang bo myung won ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((yang yang) or (wang yan)) ((yin yun) or (((yan yuan) OR (yan guan)))) chen yugang bo myung won ;".
• Adding a wildcard symbol may retrieve word variants: ((yang yang) or (wang yan)) ((yin yun) or (((yan yuan) OR (yan guan)))) chen yugang bo myung won ;*.