Perhaps you should try some spelling variations:
"import re integration theories." » "import re integration theorems.", "import re integrationstheorie 2.", "import re integration theory.", "import de integration theories.", "import fare integration theories.", "import care integration theories.", "import _ integration theories.", "import price integration theories.", "import share integration theories."
"export policies using services." » "import policies using services.", "support policies using services.", "efforts policies using services.", "export policies during services.", "export policies using service.", "export policies nursing services.", "export policies housing services."

Try widening your search to All Fields.

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (("import re integration theories.") or ("export policies using services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import re integration theories.") OR ("export policies using services.")).
• Removing quotes may allow a broader search: (( import re integration theories. ) or ( export policies using services. )).
• Adding a wildcard symbol may retrieve word variants: (("import re integration theories.") or ("export policies using services."))*.