Perhaps you should try some spelling variations:
pumping control » pacing control, comparing control, computing control
using control » losing control, dosing control, taking control
than change » chain change, can change, mean change
wang qian » wang qiao, wang qin, wang liang
qian kang » qian wang, qian rong, qian yan
han chang » huang chang, can change, chin chang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: wang qian kang ((han chang) OR (than change)) chuan ((using control) OR (pumping control)) bi ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang qian kang ((han chang) or (than change)) chuan ((using control) OR (pumping control)) bi ;~".
• Adding a wildcard symbol may retrieve word variants: wang qian kang ((han chang) or (than change)) chuan ((using control) OR (pumping control)) bi ;*.