Not knowing where your pets are can be very frustrating, and exhausting. You didn't mention if they have collars/tags on or if they are microchipped. Having a collar on a pet is a great "identifying" mark.
My suggestions for losing a pet are:
1. Make signs, a lot of them. Put $$$Reward Offered$$$ on sign. Put a recent pic of both dogs. Office Max or Staples can make 100/200 signs in no time at all and really, it is nice because searching for your pet can be a full time job !
2. Distribute everywhere ! Talk to everyone you see that is out about them.
3. Put food and water out in front of your door, just in case they "smell" it and come home. If you get ants, put the food in a pie plate and fill pie plate with cold water. Ants won't cross the water.
4. Visit the animal control daily as part of your routine.
5. Call local vets to alert them that your pet is lost, should anyone bring them in to be scanned. Post a bulletin at vet or they will keep a "card" on the counter about your pet.
6. Visit grocery stores/pet stores and place your "lost pet" poster on bulletin boards.
7. Call Pets 911 and Missing Mutts, and the local HSUS to ask them to put your pet in their database. Ask them what other organizations to call to place your pet in their database. Once your find your pets, don't forget to call to remove from database.
8. It sounds gross, but when my cat was missing, every morning - like 5am, I would call dead animal pick-up to see if they picked one up fitting pet's description. (They didn't pick up my pet.)
9. Place "Lost Pet" ad in your local papers, like the Tribune and the AZ Republic. You could place one on CraigsList too and any other place you can think of that can get the word out. The more people that hear about your missing pet, it increases your chances.
Good luck and don't forget to remove all posters, flyers, ads, when you find your pet. I did end up finding my cat. It took 8 nights ! I hope your find your pets !
When you get them back, please have them neutered. It will help to curb their "roaming" desires as it is "pure torture" for them as they can smell a female in heat up to a mile. It also decreases their risk for certain cancers and of course, helps stop the cycle of pet overpopulation.