Perhaps you should try some spelling variations:
"supply china integrating policies." » "supply china international policies.", "supply china integrating countries.", "supply china immigration policies.", "supply china integration policies.", "supply china integrated policies.", "supply count integrating policies.", "supply chains integrating policies.", "supply chain integrating policies."
"supply surface irrigation schemes." » "supply scale irrigation schemes.", "supply surface irrigation scheme.", "supply surface irrigation systems.", "supply service 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 surface irrigation schemes.") or ("supply china integrating policies."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply surface irrigation schemes.") OR ("supply china integrating policies."))*.
• Removing quotes may allow a broader search: (( supply surface irrigation schemes. ) or ( supply china integrating policies. ))*.