If you are used to how filters work in osu! in-game list, it's pretty much the same. You can give a list of criteria separated by commas.
The criteria currently available are (case is not important) :
AR, OD, HP, CS, duration, density, downloads.
Available operators : < > = >= <=
AR>4, AR<=8.4, duration=120
Match beatmaps that have AR between 4 and 8.4 (included) and duration strictly equal to 120 seconds.