Perhaps you should try some spelling variations:
sun qiang » sun xifang, jun qian, sun ang
wage gaps » wage gap
qiang has » king has
jin tang » jin kang, jin chang, jing fang
tang min » chang min, sang minh, yang mind
wage law » wage gap
min non » main non, mind non, min hong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: jin tang min non ((wage law) or (wage gaps)) sun qiang has ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: jin tang min non ((wage law) OR (wage gaps)) sun qiang has ;*.