Perhaps you should try some spelling variations:
present challenges » current challenges, assessment challenges
recent challenges » recent changes, treatment challenges, emergent challenges
facing hong » facing non, facing change, facing china
hong ghi » zhong zhi, hong g, hong hai
wan yan » wang yan, nan yan, wai yan
yang xi » yang di, yang yi, yang jui
ya 3 » a 3, 2a 3, 4a 3

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wan yan) or (yang xi))ng ya 3 ((recent challenges) OR (present challenges)) facing hong ghi ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wan yan) OR (yang xi))ng ya 3 ((recent challenges) OR (present challenges)) facing hong ghi ;.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wan yan) or (yang xi))ng ya 3 ((recent challenges) OR (present challenges)) facing hong ghi ;".
• Adding a wildcard symbol may retrieve word variants: ((wan yan) or (yang xi))ng ya 3 ((recent challenges) OR (present challenges)) facing hong ghi ;*.