Perhaps you should try some spelling variations:
"export process integration theories." » "export process integration theorems.", "export process integrationstheorie 2.", "export process integration theory.", "export process innovation theories.", "export process information theories.", "export proceeds integration theories.", "export prices integration theories.", "import process integration theories."
"efforts policies meeting services." » "effects policies meeting services.", "export policies meeting services.", "forms policies meeting services.", "efforts policies being services.", "efforts policies dealing services.", "efforts policies sealing services.", "efforts policies testing services.", "efforts policies heating services.", "efforts policies marketing services."

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

• If you are trying to use Boolean operators, they must be ALL CAPS: (("export process integration theories.") OR ("efforts policies meeting services."))~.
• Removing quotes may allow a broader search: (( export process integration theories. ) or ( efforts policies meeting services. ))~.
• Adding a wildcard symbol may retrieve word variants: (("export process integration theories.") or ("efforts policies meeting services."))*.