Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
challenges 5 » challenges 1, challenges 3
wang yang » wang yan, wang liang, wang yanling
a present » _ present, 3 present, 2 present
yang jui » yang judy, yang xi, yang yi
ya a » a a, y a, ye a
dang » dan, lang, dans

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 jui) or (yang di))))ng ya a present challenges 5 dang (hai OR hari) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (((yang jui) OR (yang di))))ng ya a present challenges 5 dang (hai OR hari) ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (((yang jui) or (yang di))))ng ya a present challenges 5 dang (hai OR hari) ;".
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (((yang jui) or (yang di))))ng ya a present challenges 5 dang (hai OR hari) ;*.