Perhaps you should try some spelling variations:
yihan guan » yan guan
yang guang » yang yang, yan guan, yang liang
yan yuan » yan guan, fang yuan, nan yan
tan yong » tan hong, tan kong, tan yang
yong duc » tung duc, long du, yong c
duc dann » duc dang, durch dann, um dann
dann hat » wann hat, dang hai, man hat
wang » wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: (wang OR wing) hyoung ((((yan yuan) or (yihan guan))) or (yang guang)) tan yong duc dann hat ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (wang OR wing) hyoung ((((yan yuan) OR (yihan guan))) OR (yang guang)) tan yong duc dann hat ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(wang OR wing) hyoung ((((yan yuan) or (yihan guan))) or (yang guang)) tan yong duc dann hat ;*".