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
seed testing » field testing
supply seed » supply needs, supply second, supply sides

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 testing services. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply large irrigation scheme. ) or ( supply seed testing services. ))*.