Perhaps you should try some spelling variations:
hear gain » heat gain
yan liang » yang liang, wang liang, you liang
wenn man » kann man, wenn das
can hear » can gear, can learn, can help
yang jin » yang jie, yang jun, ying jin
man can » man han, woman can, man kann
hai » hadi, haji, hari

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

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