Perhaps you should try some spelling variations:
"support grant integration theories." » "support grant integration theorems.", "support grant integrationstheorie 2.", "support grant integration theory.", "support migrant integration theories.", "support migrants integration theories.", "support statt 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: (("support grant integration theories.") OR ("import trade integration series."))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"support grant integration theories.\") OR (\"import trade integration series.\"))*".
• Removing quotes may allow a broader search: (( support grant integration theories. ) OR ( import trade integration series. ))*.