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 low irrigation schemes." » "supply low irrigation scheme.", "supply low irrigation systems.", "supply led irrigation schemes.", "supply flood irrigation schemes.", "supply local irrigation schemes.", "supply how irrigation schemes.", "supply crowd 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: (("supply cost integration theories.") or ("supply low irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply cost integration theories.") OR ("supply low irrigation schemes."))*.
• Removing quotes may allow a broader search: (( supply cost integration theories. ) or ( supply low irrigation schemes. ))*.