Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
legacy irrigation » mega irrigation, led irrigation, gray irrigation
learning services » learning series, warning services, planning services
export from » exports from, report from, export boom
export crop » export crops

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support legacy irrigation schemes. ) or ( ((export from) OR (export crop)) learning services. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support legacy irrigation schemes. ) OR ( ((export from) OR (export crop)) learning services. )).
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( support legacy irrigation schemes. ) or ( ((export from) OR (export crop)) learning services. ))".
• Adding a wildcard symbol may retrieve word variants: (( support legacy irrigation schemes. ) or ( ((export from) OR (export crop)) learning services. ))*.