Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
prices inflation » price inflation, price insulation, triggers inflation
inflation theory » information theory, innovation theory, incubation theory
can irrigation » canal irrigation, tank irrigation, change irrigation
export prices » import prices
support can » support chuan, support bank, support a

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

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