I haven't really done much in the way of exporting query builder report to put back into a search. Now we have done a trick before in Excel to take a column of results and put them into a row based result, then put that into something like wordpad, then replace the tabs with a semicolon and use that for the search result (e.g. pn1;pn2;pn3;pn4;...)
In any regards it still makes getting long search strings difficult.
Certainly something that still needs additional enhancements to help improve.