Perhaps you should try some spelling variations:
"supply cost integration theories." » "supply cost integration theory.", "supply cost integration through.", "supply cost integration efforts.", "supply south integration theories.", "supply tool integration theories.", "supply can integration theories.", "supply costs integration theories."
"supply gravity irrigation schemes." » "supply private irrigation schemes.", "supply gravity irrigation scheme.", "supply gravity irrigation systems.", "supply quality 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: (("supply cost integration theories.") OR ("supply gravity irrigation schemes."))~.
• Removing quotes may allow a broader search: (( supply cost integration theories. ) or ( supply gravity irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply cost integration theories.") or ("supply gravity irrigation schemes."))*.