Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
internet services » internet service
spate irrigation » scale irrigation, water irrigation, surface irrigation
supply spate » supply system, supply side, supply water
supply grid » supply crowd, support grid

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

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