Perhaps you should try some spelling variations:
"support data integration theories." » "support data integration theory.", "support data integration through.", "support data integration efforts.", "support trade integration theories.", "support _ integration theories.", "support data integrity theories.", "import data integration theories.", "support a integration theories.", "export data integration theories."
"supply crop irrigation schemes." » "supply crop irrigation scheme.", "supply crop irrigation systems.", "supply drip irrigation schemes.", "supply scale irrigation schemes.", "supply canal irrigation schemes.", "supply crowd irrigation schemes.", "supply curve irrigation schemes."

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: (("support data integration theories.") OR ("supply crop irrigation schemes."))~.
• Removing quotes may allow a broader search: (( support data integration theories. ) or ( supply crop irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support data integration theories.") or ("supply crop irrigation schemes."))*.