Perhaps you should try some spelling variations:
heat gain » health gain, health gains, wheat grains
dang hadi » dang hai
yang lin » yang jin, yang li, yang liang
wang lin » wang li, wang qin, wang limin
yang jie » yang jin, yang di, yang jui
yang xi » yang di, yang yi, yang jui
yan » ryan
yang » ryang

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 tube heat gain ((((yang lin) OR (wang lin))) or (((yang jie) or (yang xi)))) dang hadi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang yan tube heat gain ((((yang lin) OR (wang lin))) OR (((yang jie) OR (yang xi)))) dang hadi ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang yan tube heat gain ((((yang lin) OR (wang lin))) or (((yang jie) or (yang xi)))) dang hadi ;".
• Adding a wildcard symbol may retrieve word variants: wang yan tube heat gain ((((yang lin) OR (wang lin))) or (((yang jie) or (yang xi)))) dang hadi ;*.