Perhaps you should try some spelling variations:
pumping control » pacing control, comparing control, computing control
using control » losing control, dosing control, taking control
chang chuan » chung chuan, chen chuan, chang ch'un
wang qian » wang qiao, wang qin, wang liang
qian wang » yiqian wang, qian rong, qian yan
han chang » huang chang, than change, can change
wang han » wang yan, kang han, wang ban

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "wang qian wang han chang chuan ((using control) OR (pumping control)) bi ;~".
• Adding a wildcard symbol may retrieve word variants: wang qian wang han chang chuan ((using control) OR (pumping control)) bi ;*.