Perhaps you should try some spelling variations:
recent challenges » present challenges, recent changes, treatment challenges
bonding among » bombing among, funding among, building among
gas recent » gap recent, cas recents, gaap recent
nan yan » nan ya, wang yan, qian yan
yang xi » yang di, yang yi, yang jui
ra gas » raw gas, ras gas, real gas

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nan yan) or (yang xi))ng ra gas recent challenges ((bonding among) OR (belonging among)) di ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nan yan) OR (yang xi))ng ra gas recent challenges ((bonding among) OR (belonging among)) di ;*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((nan yan) or (yang xi))ng ra gas recent challenges ((bonding among) OR (belonging among)) di ;*".