Perhaps you should try some spelling variations:
"support state integration theories." » "support state integration theory.", "support state integration through.", "support state integration efforts.", "support system integration theories.", "support state interactions theories.", "support trade integration theories.", "support staff integration theories.", "support strategy integration theories.", "support estimate integration theories."
"support water integration schemes." » "support water irrigation schemes.", "support water integration some.", "support water integrating schemes.", "support factor integration schemes.", "support data integration schemes.", "support better integration schemes.", "support what's integration schemes.", "support worker integration schemes."

Try widening your search to All Fields.

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