Perhaps you should try some spelling variations:
"export taxes integration regimes." » "export taxes immigration regimes.", "export taxes international regimes.", "export taxes integration regional.", "export spaces integration regimes.", "export values integration regimes.", "export res integration regimes."
"support grant interaction series." » "support grant interactions series.", "support grant interaction studies.", "support grant interaction terms.", "support graph interaction series.", "support gradient interaction series.", "support plant interactions 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: (("support grant interaction series.") OR ("export taxes integration regimes."))~.
• Removing quotes may allow a broader search: (( support grant interaction series. ) or ( export taxes integration regimes. ))~.
• Adding a wildcard symbol may retrieve word variants: (("support grant interaction series.") or ("export taxes integration regimes."))*.