Perhaps you should try some spelling variations:
when chang » when change, shen chang, when chance
chang won » chang soon, chang ann, chang min
guan wei » hua wei, guan li, han wei
wei when » wei shen, ii when, wei ben
chang ha » chang mae
wang yue » wong yue, wang hua, wang yan
du yan » du yang, xu yan, du yabin

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((du yan) OR (mu yan)) guan wei when chang won ((chang ha) or (wang yue)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((du yan) OR (mu yan)) guan wei when chang won ((chang ha) OR (wang yue)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((du yan) OR (mu yan)) guan wei when chang won ((chang ha) or (wang yue)) ;*".