Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
policy integration » political integration, policy international, policy intervention
integration theory » integration through, information theory, innovation theory
syria irrigation » africa irrigation, drip irrigation, surge irrigation
support policy » support policies, import policy
support syria » support social, support agri

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 ( support policy integration theory. ))~.
• Adding a wildcard symbol may retrieve word variants: (( support syria irrigation schemes. ) or ( support policy integration theory. ))*.