Perhaps you should try some spelling variations:
challenges min » challenges m, challenges making, challenges moving
wang yang » wang yan, wang liang, wang yanling
a current » 2 current, 1 current, 4 current
3 current » 3 concurrent
min shang » bin zhang, jin chang, min hong
shang hai » shang kai, dang hai, chang ha
yang xi » yang di, yang yi, yang jui

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yang) or (yang xi))ng ya ((a current) OR (3 current)) challenges min shang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (yang xi))ng ya ((a current) OR (3 current)) challenges min shang hai ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang xi))ng ya ((a current) OR (3 current)) challenges min shang hai ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang xi))ng ya ((a current) OR (3 current)) challenges min shang hai ;*.