Perhaps you should try some spelling variations:
crisis model » crisis models, crises model, crises models
bond credit » beyond credit, sound credit, good credit
crisis were » crises were, crisis war, crisis wave
wang huang » wang luhang, wang hua, wang liang
huang ting » huang jing, huang ying, huang bin
ting bond » long bond

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

• Performing a fuzzy search may retrieve terms with similar spellings: wang huang ting bond credit rating ((crisis model) OR (crisis were)) six ;~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "wang huang ting bond credit rating ((crisis model) OR (crisis were)) six ;*".