Perhaps you should try some spelling variations:
hear gain » heat gain
yang yang » wang yang, wang yan
can hear » can gear, can learn, can help
ying jin » yang jin, jing ji, yang jie
wan man » woran man, kann man, wenn man
ann man » kann man, wenn man
yang yi » yang di, yang xi, yang jui
tan » than

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

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