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It really is unrelated to FFDL, but it most likely means further narrowing down search results from a previous search. Imagine searching for the "Buffy" character in the set of all stories -- the result is a subset of all stories. Now you can narrow down the result even further by searching for "Spike". This should be equivalent to searching for both: "Buffy" and "Spike" within a single search, but this multi-pass search allows you more control and flexibility.
EDIT: I also just noticed that you asked to be sent a PM, sorry about that. Anyways, in case someone has a similar question they might now find this thread (and the answer) via Google.
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