Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
canal irrigation » scale irrigation
gaps regulating » gas regulation, ban regulating, cues regulating
supply canal » supply canada, supply annual, supply china
support gaps » support groups, support grant, support crops

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 schemes. ) or ( support gaps regulating services. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply canal irrigation schemes. ) OR ( support gaps regulating services. )).
• Adding a wildcard symbol may retrieve word variants: (( supply canal irrigation schemes. ) or ( support gaps regulating services. ))*.