Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
spate irrigation » scale irrigation, water irrigation, surge irrigation
supply spate » supply system, supply side, supply water
support grid » support agri, support grant, support group
supply grid » supply crowd, supply great
service. » services.

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) OR (support grid)) internet service. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply spate irrigation schemes. ) OR ( ((supply grid) OR (support grid)) internet service. ))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply spate irrigation schemes. ) or ( ((supply grid) OR (support grid)) internet service. ))*".