Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
challenges 5 » challenges 1, challenges 3
2 present » _ present, 3 present
wang yang » wang yan, wang liang, wang yanling
yang xi » yang yi, yang jui
dan hai » dang hai, dan phan, dann hat
5 dan » 5 das, _ dan, 5 den
ng a » lng a, ngo a, png 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 judy) or (yang xi))) or (yang di))))ng a 2 present challenges 5 dan hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (((((yang judy) OR (yang xi))) OR (yang di))))ng a 2 present challenges 5 dan hai ;.
• Adding a wildcard symbol may retrieve word variants: ((wang yang) or (((((yang judy) or (yang xi))) or (yang di))))ng a 2 present challenges 5 dan hai ;*.