Defensive Throw( Oriental Adventures, p. 62)
You can use your opponent's weight, strength, and momentum against her, deflecting her attack and throwing her to the ground.
The Gentle Way Mastery (OA) ,
If the opponent you have chosen to receive your AC bonus from the Dodge feat attacks you and misses, you can make an immediate improved trip attack against that opponent. This attempt counts against your allowed attacks of opportunity this round.