Perhaps you should try some spelling variations:
david chang » david ching, david chan, david chieng
david zhang » david chan, david hand, david tang
yuan yong » yuan ying, huan yong, kuan yong
yong hui » ong hui, wong hui, yong hoi
wei dan » wei han, wei lan, wei da
dan xi » dian xi, dan xin, han xi
di tan » dui tan, yi tan, ji tan
de di » de yi, de li, de ji
wen » when

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( yuan yong hui de ((david chang) or (david zhang)) wei dan xi. ) or ( yuan yong hui de di tan wen da xi. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( yuan yong hui de ((david chang) OR (david zhang)) wei dan xi. ) OR ( yuan yong hui de di tan wen da xi. )).
• Adding a wildcard symbol may retrieve word variants: (( yuan yong hui de ((david chang) or (david zhang)) wei dan xi. ) or ( yuan yong hui de di tan wen da xi. ))*.