Perhaps you should try some spelling variations:
yang guang » yang yang, yan guan, yang liang
human gene » human genome, human gender, human bone
yan tuan » yan guan, yan yuan, anh tuan
yang jin » yang jie, ying jin, shang jin
yang jun » yang jui, pang jun, yang judy
wong sau » wong sam, wong siu, wong shiu
wang » wing, wan, lang

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 ((yan tuan) OR (yang guang)) human gene ((yang jin) OR (yang jun)) wong sau ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yan tuan) or (yang guang)) human gene ((yang jin) or (yang jun)) wong sau ;*.