Perhaps you should try some spelling variations:
challenges gao » challenges call, challenges 1, challenges 3
wang yang » wang yan, wang liang, wang yanling
1 current » 2 current, 3.1 current
3 current » 3 concurrent
gao shang » gao zhong, hao zhang
shang hai » shang kai, dang hai, chang ha
ng y » ng _, g y, na y

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 di))ng y ((1 current) or (3 current)) challenges gao shang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (yang di))ng y ((1 current) OR (3 current)) challenges gao shang hai ;.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang di))ng y ((1 current) or (3 current)) challenges gao shang hai ;*.