Perhaps you should try some spelling variations:
irrigation scheme » irrigation systems
large irrigation » farm irrigation, drip irrigation, scale irrigation
testing services » existing services, lending services, training services
supply large » supply charges, supply targets, supply curve
supply seed » supply second, supply sides, supply asset

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (( supply large irrigation scheme. ) OR ( ((supply seed) OR (supply needs)) testing services. ))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "(( supply large irrigation scheme. ) or ( ((supply seed) OR (supply needs)) testing services. ))~".
• Adding a wildcard symbol may retrieve word variants: (( supply large irrigation scheme. ) or ( ((supply seed) OR (supply needs)) testing services. ))*.