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 curve irrigation schemes." » "supply curve irrigation scheme.", "supply curve irrigation systems.", "supply surge irrigation schemes.", "supply large irrigation schemes.", "supply crop 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 curve irrigation schemes.") or ("supply vertical integration series."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply curve irrigation schemes.") OR ("supply vertical integration series."))*.
• Removing quotes may allow a broader search: (( supply curve irrigation schemes. ) or ( supply vertical integration series. ))*.