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
zhong tai » hong tan, hong hai, zhong zhi
yang jui » yang judy, yang di, yang xi
yang yi » yang di, yang xi
5 zhong » 2 zhong, ji zhong, wu zhong
ngo a » ngos a, neo a, ngo 1
a a » a la

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 yi))))ngo a a present challenges 5 zhong tai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (((yang jui) OR (yang yi))))ngo a a present challenges 5 zhong tai ;.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (((yang jui) or (yang yi))))ngo a a present challenges 5 zhong tai ;*.