Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
wang yang » wang yan, wang liang, wang yanling
a present » _ present, 3 present, 2 present
yang yi » yang di, yang xi, yang jui
3 young » _ young, 4 young
a young » _ young
ng y » ng _, g y, na y
y a » y la

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 yang) OR (yang yi))ng y a present challenges ((3 young) OR (a young)) hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang yi))ng y a present challenges ((3 young) OR (a young)) hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang yi))ng y a present challenges ((3 young) OR (a young)) hai ;*.