Perhaps you should try some spelling variations:
decrease desertification » areas desertification (Expand search), decrease nitrification (Expand search), jeremoabo desertification (Expand search)
desertification process » identification process (Expand search), identification processes (Expand search)
decrease their » increase their (Expand search), decreases the (Expand search)
their decrease » their disease (Expand search), the decreased (Expand search), term decrease (Expand search)
decrease the » decreases the (Expand search), decrease in (Expand search), decrease of (Expand search)
the decrease » to decrease (Expand search), and decrease (Expand search)
or decrease » of decrease (Expand search), not decrease (Expand search), to decrease (Expand search)
decrease or » decrease of (Expand search), decrease on (Expand search), decrease pro (Expand search)

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

• Removing quotes may allow a broader search: (( decrease their decrease desertification process ) OR ( decrease or decrease the decrease ))~.