Perhaps you should try some spelling variations:
wang yidan » wang yan
chin chang » china chang, chain change, china zhang
wang wang » wang yang, wang liang, wang yan
yidan doa » dan doa
kong heng » kong hang, kong hong, dong sheng
doa chin » toh chin
won hong » hong hong, kong hong, wang hong

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang yidan doa chin chang ((won hong) or (kong heng)) yu ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang yidan doa chin chang ((won hong) OR (kong heng)) yu ;*.