Perhaps you should try some spelling variations:
"export trade integration theories." » "export trade integration theorems.", "export trade integrationstheorie 2.", "export trade integration theory.", "export taxes integration theories.", "export base integration theories.", "export tax integration theories."
"import data lending services." » "import data nonlending services.", "import data planning services.", "import data banking services.", "import data sending services.", "import data linking services.", "import data finding services.", "import duty lending services."

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

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