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."
"support grant irrigation schemes." » "support grant irrigation scheme.", "support grant irrigation systems.", "support grain irrigation schemes.", "support gray irrigation schemes.", "support gravity 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: (("support grant irrigation schemes.") OR ("support data integration theories."))~.
• Removing quotes may allow a broader search: (( support grant irrigation schemes. ) or ( support data integration theories. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grant irrigation schemes.") or ("support data integration theories."))*.