Perhaps you should try some spelling variations:
wang luhang » wang liang, wang lihong, wang yuhan
zhang zhang » zhen zhang, cheng zhang, zhang fang
cost using » costs using, cost housing, test using
using risk » during risk, using rs, funding risk
risk cong » risk coping, risk among, risk along
using ed » using 4d, using e, using 3d
ying eu » ying zhu, using eu, ying hua

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 luhang) OR (zhang zhang)) ((ying eu) OR (using ed)) cost using risk cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang luhang) or (zhang zhang)) ((ying eu) or (using ed)) cost using risk cong shu ;*.