Perhaps you should try some spelling variations:
challenges amin » challenges ramina, challenges amidst, challenges a
3 current » 3 concurrent
amin hong » min hong, among hong, tin hong
lang yan » wang yan, wang yang, zhang yan
hong hai » shang hai, zhong tai, dang hai
yang xi » yang di, yang yi, yang jui
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: ((lang yan) or (yang xi))ng y ((2 current) or (3 current)) challenges amin hong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((lang yan) OR (yang xi))ng y ((2 current) OR (3 current)) challenges amin hong hai ;.
• Adding a wildcard symbol may retrieve word variants: ((lang yan) or (yang xi))ng y ((2 current) or (3 current)) challenges amin hong hai ;*.