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You have the right to repossess the vehicle, resell the vehicle, and pursue him for any deficiency in the amount less than what you are owed from the sale thereof.
You can also charge him the cost of repossession and all other associated charges and costs.
You will have to somehow find the vehicle. You can also file theft charges against him - go to the DA's office and file a private criminal complaint against him.
Although you paid to have the vehicle repossessed the last time - he should have paid those repossessions fees before you gave him the vehicle back or you shouldn't have given him the vehicle back.
You can hire a repossession company which looks like it may be your best alternative or try following him around.