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, chang ch'un, chang chen
wang qian » wang qiao, wang qin, wang liang
qian wang » yiqian wang, qian rong, qian yan
wang han » wang yan, kang han, wang ban

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