Perhaps you should try some spelling variations:
country's integration » countries integrating, country integrated, china's integration
integration theory » integration through, information theory, integration report
irrigation schemes » irrigation scheme, irrigation systems
supply country's » supply contracts, supply contract
farm irrigation » scale irrigation, canal irrigation

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

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