Perhaps you should try some spelling variations:
"support carbon integration theory." » "support carlo integration theory.", "support urban integration theory.", "support can integration theory.", "support carbon integration through.", "support carbon information theory.", "support carbon innovation theory.", "supporting carbon integration theory.", "support common integration theory."
"supply drop irrigation system." » "supply drop irrigation systems.", "supply drop irrigation water.", "supply drop irrigation scheme.", "supply drip irrigation system.", "supply crop irrigation system.", "supply from irrigation system.", "supply europe irrigation system.", "supply crowd irrigation system."

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support carbon integration theory.\") OR (\"supply drop irrigation system.\"))~".
• Removing quotes may allow a broader search: (( support carbon integration theory. ) OR ( supply drop irrigation system. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support carbon integration theory.") OR ("supply drop irrigation system."))*.