Perhaps you should try some spelling variations:
"import prices integrating policies." » "import prices integration policies.", "import prices integrated policies.", "import prices integrating positive.", "import process integrating policies.", "import policies integrating policies.", "import services integrating policies.", "input prices integrating policies."
"import trade interaction series." » "import trade interactions series.", "import trade interaction studies.", "import trade interaction terms.", "import trade integration series.", "import face interaction series.", "import time interaction series.", "export trade interaction series.", "import price interaction series.", "import taxes interaction series."

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: (("import trade interaction series.") OR ("import prices integrating policies."))~.
• Removing quotes may allow a broader search: (( import trade interaction series. ) or ( import prices integrating policies. ))~.
• Adding a wildcard symbol may retrieve word variants: (("import trade interaction series.") or ("import prices integrating policies."))*.