Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
curve irrigation » surge irrigation, large irrigation, crop irrigation
ababa integrated » gambia integrated, global integrated, based integrated
supply ababa » supply canada, supply asia, supply data
systems. » system.

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

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