Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
price information » private information, price inflation
a irrigation » _ irrigation, farm irrigation, mega irrigation
import price » import prices, export price, export prices
support a » support _

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( support a irrigation schemes. ) or ( import price information theory. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( support a irrigation schemes. ) OR ( import price information theory. )).
• Adding a wildcard symbol may retrieve word variants: (( support a irrigation schemes. ) or ( import price information theory. ))*.