Perhaps you should try some spelling variations:
irrigation system » irrigation systems, irrigation water, irrigation scheme
dis information » mis information, aids information, des informations
cost irrigation » crop irrigation, cost mitigation, et irrigation
support dis » support does, support de, support big
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: (( support dis information theory. ) or ( supply cost irrigation system. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support dis information theory. ) OR ( supply cost irrigation system. )).
• Adding a wildcard symbol may retrieve word variants: (( support dis information theory. ) or ( supply cost irrigation system. ))*.