Perhaps you should try some spelling variations:
david chang » david ching, david zhang, david chieng
david chan » david ching, david cohen
yuan yong » huan yong, kuan yong, yuan yang
yuan ying » yuan ming, kuan ying
weng da » wang da, neng da, weng wah
tao wen » gao wen, yao wen, dao wen
de li » de la, de yi

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) or (yuan ying)) wo de ((david chang) OR (david chan)) weng da xi. ) or ( ((yuan yong) or (yuan ying)) wo de li tao wen da xi. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( ((yuan yong) OR (yuan ying)) wo de ((david chang) OR (david chan)) weng da xi. ) OR ( ((yuan yong) OR (yuan ying)) wo de li tao wen da xi. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( ((yuan yong) or (yuan ying)) wo de ((david chang) OR (david chan)) weng da xi. ) or ( ((yuan yong) or (yuan ying)) wo de li tao wen da xi. ))".
• Adding a wildcard symbol may retrieve word variants: (( ((yuan yong) or (yuan ying)) wo de ((david chang) OR (david chan)) weng da xi. ) or ( ((yuan yong) or (yuan ying)) wo de li tao wen da xi. ))*.