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The equipment you described, a CoolerMaswer HAF 932, usually comes with a parts box with the screws needed to secure the motherboard to the case. The screws that are needed are 9mm Hex 6/32. Since they get screwed into the standoffs, so they do not need to reach the case.
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I would be glad to help. Although most cases come with the necessary mounting hardware for your motherboard, it is possible the screws were lost or not provided. If the standoffs fit properly into the case and the mounting positions match the positions on your motherboard, I would measure the thickness of your motherboard, and use the screw information provided earlier and take this information and one of the standoffs to your local hardware store. Make sure to test screws that either screw completely into the standoffs or that stop with a gap smaller than the thickness of the motherboard. Make sure the screws fit smoothly and snuggly into the standoffs. If you notice any resistance at all you should stop and try a different screw.
Also, most motherboard mounting screws are the same size as other common computer hardware mounting screws. If you have any other computer screws lying around, I would test those as well, as they often work. Make sure they pass the test I mentioned earlier.