Perhaps you should try some spelling variations:
runoff irrigation » runoff mitigation, under irrigation, minor irrigation
irrigation scheme » irrigation systems
effort strategic » efforts strategies, reform strategic, export strategies
support runoff » support turnoff
options term » options theory, options others, options key
options sri » options free, options site, options step

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support runoff irrigation scheme. ) or ( effort strategic ((options term) or (options sri)). ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support runoff irrigation scheme. ) OR ( effort strategic ((options term) OR (options sri)). )).
• Adding a wildcard symbol may retrieve word variants: (( support runoff irrigation scheme. ) or ( effort strategic ((options term) or (options sri)). ))*.