Perhaps you should try some spelling variations:
rates saving » water saving, rates during, rates using
saving using » savings using, carving using, sensing using
yihan guan » yan guan
dose rates » dose rate, des rates
yan yuan » yan guan, fang yuan, nan yan
dong wei » wang wei, dong di, dong hoi
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 yuan) OR (yihan guan)) dose rates saving using ((dong sin) OR (dong wei)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang ((yan yuan) or (yihan guan)) dose rates saving using ((dong sin) or (dong wei)) ;*.