Perhaps you should try some spelling variations:
yang yajing » jiang yajing, yang yang, yang jing
yajing hua » ying hua
chen chang » chen chung, chin chang, shen chang
seok jeong » seok hong
wang yang » wang yan, wang liang, wang yanling
soon seng » soon beng, soon heng, khoon seng
hua chen » jui chen, yu chen, a chen

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang yang yajing hua chen chang ((seok jeong) or (soon seng)) seo ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yang yajing hua chen chang ((seok jeong) OR (soon seng)) seo ;.
• Adding a wildcard symbol may retrieve word variants: wang yang yajing hua chen chang ((seok jeong) or (soon seng)) seo ;*.