Perhaps you should try some spelling variations:
zhang zhang » zhen zhang, cheng zhang, zhang fang
wang liang » wang yang
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 eu » using e, using ed, using es
ying eu » ying zhu, 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 liang) OR (zhang zhang)) ((ying eu) OR (using eu)) cost using risk cong shu ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (zhang zhang)) ((ying eu) or (using eu)) cost using risk cong shu ;*.