Perhaps you should try some spelling variations:
challenges min » challenges m, challenges making, challenges moving
min hyoung » min hong, mun young
hyoung hai » hong hai
wang yang » wang yan, wang liang, wang yanling
yang xi » yang di, yang yi, yang jui
yet 2 » yet _, yet a, set 2
et 2 » et 20, etc 2, pt 2

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 xi))ong ((yet 2) OR (et 2)) current challenges min hyoung hai ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang xi))ong ((yet 2) OR (et 2)) current challenges min hyoung hai ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (yang xi))ong ((yet 2) OR (et 2)) current challenges min hyoung hai ;*.