Perhaps you should try some spelling variations:
china changqi » china shanghai, chin chang, china chanted
wang yiqian » wang yidan
yiqian wang » yijiang wang, liqin wang, qian wang
china chang » chin chang, china zhang, china china
hai phong » bai chong, kai hong
wai hoong » kai hong
wang did » wang di, wang david, long did

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 yiqian wang did ((china chang) OR (china changqi)) ((hai phong) OR (wai hoong)) shu ;~.
• Adding a wildcard symbol may retrieve word variants: wang yiqian wang did ((china chang) or (china changqi)) ((hai phong) or (wai hoong)) shu ;*.