Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
min hyoung » min hong
wang yang » wang yan, wang liang, wang yanling
a present » _ present, 3 present, 2 present
mun young » yun young, ju young, cyn young
yang xi » yang di, yang yi, yang jui
ong ye » ong yew, wong yue, wong yee
ye a » yet a, e a, me a

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 xi))ong ye a present challenges ((min hyoung) OR (mun young)) hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (yang xi))ong ye a present challenges ((min hyoung) OR (mun young)) hai ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang xi))ong ye a present challenges ((min hyoung) OR (mun young)) hai ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang xi))ong ye a present challenges ((min hyoung) OR (mun young)) hai ;*.