Perhaps you should try some spelling variations:
sloping land » mapping land
code during » care during, code using, role during
during risk » using risk, during crises, during crisis
wang huang » wang luhang, wang hua, wang liang
land code » land cover
how state » how estate, how states, how stable
how shih » how six, how she

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