Toilet not flushing after clearing a clog
First, insure you're using the correct plunger: a rubber one, not the newfangled fluted plastic ones. And go absolutely nuts with it. The important part is the pull-back, to dislodge the clog (you don't just push on it). If it doesn't fight you pulling back, you didn't achieve suction; change your angle.

 

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  Your ideal sink plunger, on the left, &amp; toilet plunger, on the right.


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My preference is the simple one on the left, it does everything. The 'flute' on the right always just ends up inside itself. Either of these are better than that first one though.



After that comes using a real sewer rodder. For which you might want to pull the toilet to avoid scratching or damaging it, assuming there's no other clean-outs to provide access.



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If you're sure there's no other take-offs between the toilet and the clog, you can try a Drain Cleaning Water Bladder that uses a garden hose. But if there are other take-offs however, you're going to shoot water out of the sink drain. Generally, these are only used on the main line and only if it's a soft clog. It's not going to help you if you have a kid's toy stuck in there.