Perhaps you should try some spelling variations:
sloping land » mapping land
cost during » boost during, crust during, west during
during risk » using risk, during crises, during crisis
wang huang » wang luhang, wang hua, wang liang
how stable » do stable, how scale, how state
land cost » land costs, land code, end cost
how she » how some, how safe, how shih

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 huang sloping land cost during risk ((how she) OR (how stable)) ;~.
• Adding a wildcard symbol may retrieve word variants: wang huang sloping land cost during risk ((how she) or (how stable)) ;*.