Perhaps you should try some spelling variations:
yuan cheng » yuan chang, huang cheng, yu cheng
cheng won » chang won, cheng boon, cheng han
das clan » das bilan, das land, das cern
yan guan » gan guan, yang guang, yihan guan
yan yuan » fang yuan, nan yan, yan clan
won hong » hong hong, kong hong, wang hong
hong il » jong il, hyoung il, honig ii

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

• Performing a fuzzy search may retrieve terms with similar spellings: twinn ((das clan) or (yan guan)) yan yuan cheng won hong il ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: twinn ((das clan) OR (yan guan)) yan yuan cheng won hong il ;*.