Perhaps you should try some spelling variations:
heat gain » health gain, health gains, wheat grains
yan liang » yang liang, wang liang, you liang
hua gain » run gain, hua ban, via gain
yang jie » yang jin, yang di, yang jui
hong hai » shang hai, zhong tai, dang hai
man han » man hat, man can, man kann
kann » ann

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

• Performing a fuzzy search may retrieve terms with similar spellings: kann man han ((hua gain) or (heat gain)) ((yan liang) or (yang jie)) hong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: kann man han ((hua gain) OR (heat gain)) ((yan liang) OR (yang jie)) hong hai ;.
• Adding a wildcard symbol may retrieve word variants: kann man han ((hua gain) or (heat gain)) ((yan liang) or (yang jie)) hong hai ;*.