Perhaps you should try some spelling variations:
"supply vertical integration series." » "supply regional integration series.", "supply vertical integration services.", "supply vertical interaction series.", "supply vertical integration server.", "supply partial integration series.", "supply political integration series.", "supply technical integration series."
"supply canal irrigation schemes." » "supply canal irrigation scheme.", "supply canal irrigation systems.", "supply scale irrigation schemes.", "supply canada irrigation schemes.", "supply annual irrigation schemes.", "supply china 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 canal irrigation schemes.") OR ("supply vertical integration series."))~.
• Removing quotes may allow a broader search: (( supply canal irrigation schemes. ) or ( supply vertical integration series. ))~.
• Adding a wildcard symbol may retrieve word variants: (("supply canal irrigation schemes.") or ("supply vertical integration series."))*.