Perhaps you should try some spelling variations:
wang liang » wang yang
duck dang » duc dang, buck dana
dang hadi » dang hai
dong bin » dong sin, dong di, dann bin
ein text » ein test, main text, von text
pre text » pre test, core text, die text
sang » san, lang, yang

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: ((wang liang) OR (dong bin)) ya ((ein text) OR (pre text)) sang duck dang hadi ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (dong bin)) ya ((ein text) or (pre text)) sang duck dang hadi ;*.