Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
challenges ji » challenges 1, challenges 3, challenges 5
3 present » _ present
yang yi » yang xi, yang jui
ngo a » ngos a, neo a, ngo 1
wang » wing, wan
dang » dan, dans, gang
hai » hadi, haji, hari

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((wang or lang) yan) or (((yang di) or (yang yi))))ngo a 3 present challenges ji dang hai ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((wang OR lang) yan) OR (((yang di) OR (yang yi))))ngo a 3 present challenges ji dang hai ;.
• Adding a wildcard symbol may retrieve word variants: (((wang or lang) yan) or (((yang di) or (yang yi))))ngo a 3 present challenges ji dang hai ;*.