Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
trade interaction » trade integration, face interaction, time interaction
interaction terms » interaction term
can irrigation » canal irrigation, tank irrigation, change irrigation
supply trade » supply case
supply can » supply chain, supply case, supply chai

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 trade interaction terms. ) OR ( supply can irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (( supply trade interaction terms. ) or ( supply can irrigation schemes. ))*.