Perhaps you should try some spelling variations:
training based » training case, training basics, learning based
tracking based » thinking based
du credit » de credit, 2 credit
yan yuan » yan guan, fang yuan, nan yan
wong siu » wong shiu, kong siu, wong sau
yuan du » yuan hui
wang » wing, 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 yan yuan du credit ((training based) OR (tracking based)) ((wong siu) or (cong shu)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan yuan du credit ((training based) OR (tracking based)) ((wong siu) OR (cong shu)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan yuan du credit ((training based) OR (tracking based)) ((wong siu) or (cong shu)) ;*".