Perhaps you should try some spelling variations:
"support carbon integration theory." » "support urban integration theory.", "support can integration theory.", "support care integration theory.", "support carbon integration through.", "support carbon information theory.", "support carbon integration report.", "supporting carbon integration theory."
"support deep irrigation schemes." » "support deep irrigation scheme.", "support deep irrigation systems.", "support drip irrigation schemes.", "support level irrigation schemes.", "support crop irrigation schemes.", "support does irrigation schemes.", "support them irrigation schemes.", "support data irrigation schemes."

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 (\"support deep irrigation schemes.\"))~".
• Removing quotes may allow a broader search: (( support carbon integration theory. ) OR ( support deep irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support carbon integration theory.") OR ("support deep irrigation schemes."))*.