You can use the designer, name, award, type, org, players, and tag keywords to specify which filters you want to apply.
For example, "designer=zero tag=strategy type=DM" searches all Death Matches designed by Zero with the strategy tag.
In addition, you can invert filters using != and search for ranges of player counts using >, <, >=, and <=.
For example, "designer!=marcer players>=5 type=MM" searches all Main Matches not designed by Marcer with player count at least 5.