Perhaps you should try some spelling variations:
"support data integration theories." » "support data integration theory.", "support data integration through.", "support data integration efforts.", "support trade integration theories.", "support _ integration theories.", "support data integrity theories.", "support a integration theories.", "export data integration theories.", "supply data integration theories."
"import data irrigation schemes." » "import data irrigation scheme.", "import data irrigation systems.", "import canal irrigation schemes.", "import water irrigation schemes.", "import spate irrigation schemes.", "import duty 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: (("import data irrigation schemes.") OR ("support data integration theories."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"import data irrigation schemes.\") OR (\"support data integration theories.\"))*".
• Removing quotes may allow a broader search: (( import data irrigation schemes. ) OR ( support data integration theories. ))*.