Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
asian irrigation » basin irrigation, asian immigration, indian irrigation
external service » national service
crowd external » from external, group external, show external
supply asian » supply asia, supply design, supply ann
supply crowd » supply growth, supply cost, supply from

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( supply asian irrigation schemes. ) or ( supply crowd external service. ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply asian irrigation schemes. ) OR ( supply crowd external service. ))*.