When I use filter to select some cases in my FogBugz (for example cases that active and assigned to me) I get ordered list of all cases that matches the filter. I also can easily change the filter (e.g. instead of all cases assigned to me, select all cases assigned to John Smith)

But if I want do the same via search, I can't refine the results (even if my selection was a filter - see example)
status:"active" assignedto:"Slava [ ]" type:"cases" orderby:"Priority"
Result:

As you can see in the second example I can't refine the filter, but I expect that the result should be the same. (because I use the meta-language as status, assignedto, etc...) Why I can translate the search string to filter representation?
Thanks, Slava