Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
spate irrigation » scale irrigation, water irrigation, surface irrigation
effort strategic » reform strategic, export strategies, reforms strategic
strategic action » strategic options, strategic allocation, strategic directions
support spate » support state, support system, support staff

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "(( support spate irrigation schemes. ) OR ( effort strategic action term. ))~".
• Adding a wildcard symbol may retrieve word variants: (( support spate irrigation schemes. ) OR ( effort strategic action term. ))*.