Perhaps you should try some spelling variations:
"support eu integration theories." » "support eu integration theory.", "support eu integration through.", "support eu integration efforts.", "support _ integration theories.", "support deep integration theories.", "support grid integration theories.", "support key integration theories.", "support a integration theories."
"import data integration schemes." » "import data irrigation schemes.", "import data integration some.", "import trade integration schemes.", "import _ integration schemes.", "import data integrity schemes.", "import duty integration 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 integration schemes.") or ("support eu integration theories."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import data integration schemes.") OR ("support eu integration theories."))*.
• Removing quotes may allow a broader search: (( import data integration schemes. ) or ( support eu integration theories. ))*.