Perhaps you should try some spelling variations:
"supply based immunization systems." » "supply based communication systems.", "supply based communication system.", "supply based immunization rates.", "supply basic immunization systems.", "supply mass immunization systems.", "supply case immunization systems.", "supplies based immunization systems.", "supply asia immunization systems."
"supply grid irrigation schemes." » "supply grid irrigation scheme.", "supply grid irrigation systems.", "supply grain irrigation schemes.", "supply drip irrigation schemes.", "supply gray irrigation schemes.", "supply crowd irrigation schemes.", "supply great irrigation schemes.", "support grid 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 grid irrigation schemes.") OR ("supply based immunization systems."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"supply grid irrigation schemes.\") OR (\"supply based immunization systems.\"))*".
• Removing quotes may allow a broader search: (( supply grid irrigation schemes. ) OR ( supply based immunization systems. ))*.