Perhaps you should try some spelling variations:
costs ratings » costs savings, costs creating, cost savings
ratings risk » patients risk
debt costs » debt cost
risk wrong » risk among, risk along
wrong when » wrong keen, wrong what, wrong who
wang yang » wang yan, wang liang
yang debt » yang hebat, yang dean

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

• If you are trying to use Boolean operators, they must be ALL CAPS: ((wang hyoung) OR (((wang yang) OR (wang yanling)))) yang debt costs ratings risk wrong when ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((wang hyoung) or (((wang yang) OR (wang yanling)))) yang debt costs ratings risk wrong when ;~".
• Adding a wildcard symbol may retrieve word variants: ((wang hyoung) or (((wang yang) OR (wang yanling)))) yang debt costs ratings risk wrong when ;*.