Perhaps you should try some spelling variations:
"supply gross immigration policy." » "supply gross migration policy.", "supply gross emigration policy.", "supply mass immigration policy.", "supply from immigration policy.", "supply growth immigration policy.", "supply costs immigration policy.", "supply cost immigration policy."
"supply total irrigation schemes." » "supply total irrigation scheme.", "supply total irrigation systems.", "supply local irrigation schemes.", "supply canal irrigation schemes.", "supply solar irrigation schemes.", "supplying total irrigation schemes.", "supply quotas irrigation schemes.", "supply data 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 gross immigration policy.") or ("supply total irrigation schemes."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("supply gross immigration policy.") OR ("supply total irrigation schemes."))*.
• Removing quotes may allow a broader search: (( supply gross immigration policy. ) or ( supply total irrigation schemes. ))*.