Perhaps you should try some spelling variations:
global change » global challenges
legal change » legal changes, legal challenges
dong liang » song ligang, wang liang, dong hoang
tan chinas » can china's, dan china's, can china
liang tan » liang dan, liang sun, wing tan
gong hui » tong hui, tong shui, wang hui

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: dong liang tan chinas ((legal change) OR (global change)) japan ((gong hui) OR (wang zhi)) ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "dong liang tan chinas ((legal change) OR (global change)) japan ((gong hui) or (wang zhi)) ;~".
• Adding a wildcard symbol may retrieve word variants: dong liang tan chinas ((legal change) OR (global change)) japan ((gong hui) or (wang zhi)) ;*.