Perhaps you should try some spelling variations:
"export data integration theories." » "export data integration theorems.", "export data integrationstheorie 2.", "export data integration theory.", "export data integrity theories.", "export day integration theories.", "import data integration theories."
"supply crop irrigation schemes." » "supply crop irrigation scheme.", "supply crop irrigation systems.", "supply drip irrigation schemes.", "supply scale irrigation schemes.", "supply canal irrigation schemes.", "supply crowd irrigation schemes.", "supply from irrigation schemes.", "supply europe irrigation schemes."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("export data integration theories.") OR ("supply crop irrigation schemes."))~.
• Removing quotes may allow a broader search: (( export data integration theories. ) or ( supply crop irrigation schemes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("export data integration theories.") or ("supply crop irrigation schemes."))*.