Perhaps you should try some spelling variations:
heat gain » health gain, health gains, wheat grains
dang hadi » dang hai
yan guan » gan guan, yang guang, yihan guan
yan yuan » fang yuan, nan yan, yan clan
yang jin » yang jun, ying jin, shang jin
yang jie » yang jui, yang xi, yang yi
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((yan guan) or (yan yuan)) heat gain ((yang di) or (((yang jin) or (yang jie)))) dang hadi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((yan guan) OR (yan yuan)) heat gain ((yang di) OR (((yang jin) OR (yang jie)))) dang hadi ;.
• Adding a wildcard symbol may retrieve word variants: wang ((yan guan) or (yan yuan)) heat gain ((yang di) or (((yang jin) or (yang jie)))) dang hadi ;*.