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.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"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."))*.