Perhaps you should try some spelling variations:
"import spaces integration theories." » "import spaces integration theorems.", "import spaces integrationstheorie 2.", "import spaces integration theory.", "import space integration theories.", "import success integration theories.", "import seamless integration theories.", "import sales integration theories.", "import shares integration theories."
"import trade integration series." » "import trade integration services.", "import trade interaction series.", "import trade integration server.", "export trade integration series.", "import price integration series.", "import taxes integration series."

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

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