Perhaps you should try some spelling variations:
recent challenges » present challenges, recent changes, treatment challenges
asia recent » asian decent, aid recent, russia recent
zhong zhi » zhang zhi, zhong tai
hong ghi » hong g, hong hai
yang yi » yang di, yang xi, yang jui
ngo dan » ngo van, ngo diana, ngo jean
wang » wing, wan, lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((wang yanling) or (yang yi))ngo dan asia recent challenges 1 ((hong ghi) or (zhong zhi)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yanling) OR (yang yi))ngo dan asia recent challenges 1 ((hong ghi) OR (zhong zhi)) ;.
• Adding a wildcard symbol may retrieve word variants: ((wang yanling) or (yang yi))ngo dan asia recent challenges 1 ((hong ghi) or (zhong zhi)) ;*.