Perhaps you should try some spelling variations:
challenges crises » challenges risks, challenges cases, challenges case
recent challenges » present challenges, recent changes, treatment challenges
wang yang » wang yan, wang liang, wang yanling
la recent » a recent, usa recent, 1 recent
long hai » hong hai, long chain, long haul
long han » long chain, long thanh, long haul
yang xi » yang di, yang yi, yang jui
lng a » lng _, leg a, lpg 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 xi))lng a la recent challenges crises ((long hai) OR (long han)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang yang) OR (yang xi))lng a la recent challenges crises ((long hai) OR (long han)) ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang yang) or (yang xi))lng a la recent challenges crises ((long hai) OR (long han)) ;*".