Perhaps you should try some spelling variations:
irrigation systemss » irrigation systems, irrigation system, irrigation schemes
irrigation scheme » irrigation systems
canal irrigation » scale irrigation
cost irrigation » crop irrigation, cost mitigation, et irrigation
supply canal » supply canada, supply annual, supply china
supply cost » supply costs

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply canal irrigation systemss. ) or ( supply cost irrigation scheme. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply canal irrigation systemss. ) OR ( supply cost irrigation scheme. )).
• Adding a wildcard symbol may retrieve word variants: (( supply canal irrigation systemss. ) or ( supply cost irrigation scheme. ))*.