To update this post, below are the new keywords as indicated in their official website at http://lto.gov.ph/index.php/services/text-lto: (send to 2600)

LTO New Non Pro Requirements for new Non Professional Driver’s License
LTO Renew Non Pro Requirements for renewal of Non Professional Driver’s License
LTO New Student Requirements for new Student Permit
LTO New Reg Private Procedures on new registration of private vehicles
LTO Renew Reg Private Procedures on renewal of registration of Private Vehicles
LTO Vehicle<Plate Number> Inquiries regarding motor vehicles details (e.g. pending alarms, apprehensions, last registration date, make, color, year, etc.)
LTO Complaint PUV <Plate No.> <Complaint> Complaints regarding for hire motor vehicle/s