Perhaps you should try some spelling variations:
heat gain » health gain, health gains, wheat grains
lang yan » wang yan, wang yang, zhang yan
han heat » a heat, can hear, lag heat
yang lin » wang lin, yang li, yang liang
yang jin » yang jie, yang jun, ying jin
zong hai » hong hai, dang hai, long han
yan han » man han, yan zhang, kang han

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

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