Perhaps you should try some spelling variations:
irrigation schemes » irrigation systems
irrigation scheme » irrigation systems
syria irrigation » africa irrigation, drip irrigation, surge irrigation
under irrigation » water irrigation, led irrigation
support syria » support social, support agri
supply under » supply order, supply united, supply siders

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 syria irrigation schemes. ) OR ( supply under irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support syria irrigation schemes. ) or ( supply under irrigation scheme. ))*.