Perhaps you should try some spelling variations:
challenges ma » challenges 1, challenges 3, challenges 5
challenges m » challenges 1, challenges 3, challenges 5
3.1 current » 3 current, 2.2 current, 2.3 current
wang yang » wang yan, wang liang, wang yanling
hong hai » shang hai, zhong tai, dang hai
y 3.1 » _ 3.1, i 3.1, a 3.1
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 3.1 current ((challenges ma) OR (challenges m)) hong hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (yang di))ng y 3.1 current ((challenges ma) OR (challenges m)) hong hai ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang di))ng y 3.1 current ((challenges ma) OR (challenges m)) hong hai ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang di))ng y 3.1 current ((challenges ma) OR (challenges m)) hong hai ;*.