Perhaps you should try some spelling variations:
cooperation projects » cooperation project (Expand search), cooperative projects (Expand search), conservation projects (Expand search)
decrease walking » increase walking (Expand search), decrease during (Expand search), decrease lodging (Expand search)
walking defense » walking decreases (Expand search), walking response (Expand search), alerting defense (Expand search)
decrease to » decreased to (Expand search), decrease toc (Expand search), decrease the (Expand search)

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( decrease walking defense cooperation projects ) OR ( decrease _ decrease to decrease ))~".
• Adding a wildcard symbol may retrieve word variants: (( decrease walking defense cooperation projects ) OR ( decrease _ decrease to decrease ))*.