Perhaps you should try some spelling variations:
irrigation schemes » irrigation scheme, irrigation systems
state interaction » state interactions, scale interaction, state intervention
interaction terms » interaction term
can irrigation » canal irrigation, tank irrigation, change irrigation
support state » support stage, support staff, support start
support can » support chuan, support bank, support a

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

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