Perhaps you should try some spelling variations:
staff irrigation » scale irrigation, spate irrigation, tank irrigation
effort strategic » efforts strategies, reform strategic, export strategies
strategic action » strategic options, strategic allocation, strategic directions
action term » action test, action text, action tra
systems. » system.

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( support staff irrigation systems. ) OR ( effort strategic action term. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support staff irrigation systems. ) or ( effort strategic action term. ))*.