Perhaps you should try some spelling variations:
"support chain integration theories." » "support chain integration theorems.", "support chain integrationstheorie 2.", "support chain integration theory.", "support can integration theories.", "support chuan integration theories.", "supply chain integration theories."
"support mega irrigation schemes." » "support mega irrigation scheme.", "support mega irrigation systems.", "support delta irrigation schemes.", "support led irrigation schemes.", "support et irrigation schemes.", "support me irrigation schemes.", "support legacy irrigation schemes.", "support a 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: (("support mega irrigation schemes.") or ("support chain integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support mega irrigation schemes.") OR ("support chain integration theories.")).
• Removing quotes may allow a broader search: (( support mega irrigation schemes. ) or ( support chain integration theories. )).
• Adding a wildcard symbol may retrieve word variants: (("support mega irrigation schemes.") or ("support chain integration theories."))*.