Although the family of missing trainer John Tammaro Jr. has not given up hope, the city of Hallandale Beach Police Department has had little success in its search for the 75-year-old."The investigation continues," said police spokesman Andy Kasper, "But we haven't come across anything yet." While Kasper declined to give specifics, he did mention that detectives have tried "all of the basic things that you'd expect from an investigation of this type."Son Mike Tammaro indicated that police advised him that they have located a couple of cars submerged in canals between Gulfstream Park and his father's home in Pembroke Pines, but that there was no sign of Tammaro's vehicle. The trainer was last seen leaving Gulfstream Park on the morning of Sunday, Feb. 25, driving his 1987 Mercedes 420, but has not been heard from since. There has been no reported use of his credit cards or cellular phone."I think about him once in a while, but you've just got to carry on with what you're doing," said Mike Tammaro, a Kentucky-based trainer who has been overseeing his father's stable in South Florida since the disappearance, "There's really nothing we can do except hope, and that's what we are doing."