Perhaps you should try some spelling variations:
"support state interactions theories." » "support state interactions series.", "support state integration theories.", "support state interactions theory.", "support scale interactions theories.", "support state interventions theories.", "support sea interactions theories.", "support stage interactions theories.", "support staff interactions theories.", "support start interactions theories."
"support water irrigation schemes." » "support water irrigation scheme.", "support water irrigation systems.", "support scale irrigation schemes.", "support canal irrigation schemes.", "support farm irrigation schemes.", "support chapter irrigation schemes.", "support greater irrigation schemes.", "support better irrigation schemes."

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

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