Still doesn't really tell us what you're looking for. However, from Complete Warrior... Dervish could work if you've got the 13 Intelligence for Combat Expertise. Exotic Weapon Master, if you use exotic weapons. Eye of Gruumsh, though you have to be chaotic evil, chaotic neutral, or neutral evil. Occult Slayer, if you want to kill magic users easier. Order of the Bow Initiate, if you're an archer (I'm not saying its likely with a a half-orc, but...). Ravager, but you have to be chaotic evil or neutral evil. Reaping Mauler, if you want to grapple. Ronin, if you once served a feudal lord.
Complete Adventurer also has a few, though you're more likely to need to multiclass to, say, Ranger or Rogue or Scout to meet some of the skill requirements. There's the Bloodhound, if you want to be a bounty hunter type. Ghost-Faced Killer, if you want to be a bit more stealthy. Streetfighter (Needs a 13 Intelligence of Combat Expertise). Tempest, if you dual-wield.
As other folks have said, you can also do well by just multiclassing to another class. Barbarian is the natural fit for a half-orc (so you avoid multiclass penalties).