Perhaps you should try some spelling variations:
a assessment » 3 assessment, 4 assessment, 1 assessment
challenges m » challenges 1, challenges 3, challenges 4
challenges 5 » challenges 1, challenges 3
hyoung hai » hong hai
yang yi » yang di, yang xi, yang jui
ng y » ng _, g y, na y
y a » y la
wang » wing, wan, lang

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 yanling) OR (yang yi))ng y a assessment ((challenges m) OR (challenges 5)) hyoung hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yanling) or (yang yi))ng y a assessment ((challenges m) OR (challenges 5)) hyoung hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yanling) or (yang yi))ng y a assessment ((challenges m) OR (challenges 5)) hyoung hai ;*.