Perhaps you should try some spelling variations:
yulu cheng » yulu chen, yu cheng, yuan cheng
cheng bing » cheng ling, cheng ming, chen ping
yang july » yang judy, yang jun
doing um » doing un, doing mmr, doing our
yang jui » yang judy, yang xi
um dann » und dann
bing ji » jing ji, ying jin, jing jia
yang yi » yang xi

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doing um dann yulu cheng bing ji ((((yang yi) OR (yang di))) OR (((yang jui) OR (yang july)))) ;~.
• Adding a wildcard symbol may retrieve word variants: doing um dann yulu cheng bing ji ((((yang yi) or (yang di))) or (((yang jui) or (yang july)))) ;*.