Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
challenges m » challenges 1, challenges 3, challenges 5
wang liang » wang yang
a present » _ present, 3 present, 2 present
shang hai » shang kai, dang hai, chang ha
wong lee » kong lee, wong yee, wong teek
yang xi » yang di, yang yi, yang jui
m shang » _ shang
lee a » lee _, lee g, see a

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 (yang xi))wong lee a present challenges m shang hai ;~.
• Adding a wildcard symbol may retrieve word variants: ((wang liang) or (yang xi))wong lee a present challenges m shang hai ;*.