Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
innovation theory » innovation through, motivation theory
syria irrigation » africa irrigation, drip irrigation, surge irrigation
grid innovation » ground innovation, guided innovation, period innovation
support syria » support social, support agri
support grid » support agri, support grant, support group

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support syria irrigation schemes. ) or ( support grid innovation theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support syria irrigation schemes. ) OR ( support grid innovation theory. ))*.