Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
local conservation » soil conservation, biological conservation, land conservation
trade irrigation » pradesh irrigation, scale irrigation, grain irrigation
supply trade » supply case
supply local » support local, supply block, supply law

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: (( supply trade irrigation schemes. ) OR ( supply local conservation efforts. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply trade irrigation schemes. ) or ( supply local conservation efforts. ))*.