Perhaps you should try some spelling variations:
"import value integration theories." » "import value integration theorems.", "import value integrationstheorie 2.", "import value integration theory.", "import values integration theories.", "import value iteration theories.", "import value integrating theories.", "export value integration theories."
"import price internet services." » "import price internet service.", "import pre internet services.", "import service internet services.", "import freie internet services.", "import prices internet services.", "export price internet services.", "export prices internet services."

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

• Performing a fuzzy search may retrieve terms with similar spellings: (("import value integration theories.") or ("import price internet services."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("import value integration theories.") OR ("import price internet services."))*.
• Removing quotes may allow a broader search: (( import value integration theories. ) or ( import price internet services. ))*.