Perhaps you should try some spelling variations:
"support trade integration theories." » "support trade integration theorems.", "support trade integrationstheorie 2.", "support trade integration theory.", "support trainer integration theories.", "export trade integration theories.", "import trade integration theories."
"support grant integration series." » "support grant integration services.", "support grant interaction series.", "support grant integration server.", "support migrant integration series.", "support migrants integration series.", "support statt integration series."

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