The ones that you buy at auto stores are also thin and worthless. The last three new cars I bought I was able to order a detailed service and repair manual at the parts department of the dealership. They were expensive and model specific, but returned the cost on my first DIY job. Also, the next owner gladly purchased it.
I don't know why, but there are many companies that tries to spend less paper on their manuals. So there is not that much information there. I guess there are new rules for the standard politics for the world market. Always, I think that you can search for it on their website, download everything and print. Otherwise, there is manymanuals.com, a website which is specialized in manuals. So, find the Toyota on the main page, then press Corolla and chose the years I guess. I am sure they have a more detailed manual there.