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

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: (("support data integration theories.") OR ("supply crop irrigation scheme."))~.
• Removing quotes may allow a broader search: (( support data integration theories. ) or ( supply crop irrigation scheme. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support data integration theories.") or ("supply crop irrigation scheme."))*.