Perhaps you should try some spelling variations:
"import price integration theory." » "import price integration through.", "import price information theory.", "import price innovation theory.", "import service integration theory.", "import trade integration theory.", "import price indexation theory.", "import prices integration theory.", "export price integration theory.", "export prices integration theory."
"support der integration social." » "support der international social.", "support zur integration social.", "support sector integration social.", "support de integration social.", "support under integration social.", "support deep integration social."

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: (("support der integration social.") or ("import price integration theory."))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (("support der integration social.") OR ("import price integration theory.")).
• Removing quotes may allow a broader search: (( support der integration social. ) or ( import price integration theory. )).
• Adding a wildcard symbol may retrieve word variants: (("support der integration social.") or ("import price integration theory."))*.