Perhaps you should try some spelling variations:
among patients » among nations
patients risk » patient risk, patients links, patients si
among first » among forest, among firms, saving first
liang dan » liang tan, king dan, liang sun
king eden » king dan, king ed, sin eden
can among » cancer among

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang ((liang dan) or (king eden)) can among patients risk among first ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang ((liang dan) OR (king eden)) can among patients risk among first ;*.