Perhaps you should try some spelling variations:
"import price integration theorems." » "import price integration theories.", "import price integration theory.", "import price integrationstheorie 2.", "import service integration theorems.", "import trade integration theorems.", "import price indexation theorems.", "import prices integration theorems.", "export price integration theorems.", "export prices integration theorems."
"effects policies testing services." » "efforts policies testing services.", "effective policies testing services.", "effects policy testing services.", "effects policies meeting services.", "effects policies using services.", "effects policies being services.", "effects policies existing services.", "effects policies lending services.", "effects policies training services."

Try widening your search to All Fields.

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• Performing a fuzzy search may retrieve terms with similar spellings: (("import price integration theorems.") or ("effects policies testing services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import price integration theorems.") OR ("effects policies testing services.")).
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