Get tougher chews. As other said it doesn't really end. Nylabone has different rankings of toughness. Get the toughest one. Also switch to Elk Antlers or Moose where available. Elk antlers last about 6 months at my house, where deer can go in a night or longest a month for a tough one. Also don't get them split, split are wide open exposing the softest parts.
As far as toys. You just have to find tougher ones. Ones that are weak may not ever work.
A couple I have found really durable:
Zogoflex, rubber chews. Hemi is not always overly interested in it but when he is he has a blast.
Another one Hemi likes and read this carefully. I found somewhere else this amazing rubber toy, Hemi loved it and loved it and it was tough. It is the Everlasting treat
Amazon.com : StarMark Everlasting Treat Ball, Large : Pet Chew Toys : Pet Supplies However, here is the thing. The treat sucks and it not healthy for them. So buy, it take a hammer and knock the treat out and you have a fun rubber toy that is perfect to stuff carrots in.
Freeze carrots, take them longer to get through one.
Then Toughy toys I am a huge fan of.
You might have to resort to simple ones like this sunfish
Amazon.com : Tuffy The General Sea Creature Dog Toy : Pet Squeak Toys : Pet Supplies
More complicated ones like Gary Gator here the scales down the back gave something for Hemi to rip at and pick at and chew on.
Amazon.com : Tuffys Dog Toy : Pet Chew Toys : Pet Supplies
Anyway I think it is more about finding the toys and chews that are right for your dog. No one toy and dog are the same.