Perhaps you should try some spelling variations:
irrigation system » irrigation systems, irrigation water, irrigation scheme
integrity efforts » integration efforts
syria irrigation » africa irrigation, drip irrigation, surface irrigation
supply syria » supply social
supply data » supply water

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply syria irrigation system. ) or ( supply data integrity efforts. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply syria irrigation system. ) OR ( supply data integrity efforts. )).
• Adding a wildcard symbol may retrieve word variants: (( supply syria irrigation system. ) or ( supply data integrity efforts. ))*.