After the first part of rigging, some of the polygons of the model will distort because they haven't been paint weight.
Something like this occur to the model is normal:
From here, I've learned that the polygon has to be painted using the paint weight tool to make the bone of that particular part of the polygon stronger so it will not distort or comes out from other polygon.
My tutor taught me the way of using the paint weight tool to create a stronger root for some specific bones so it won't distort when the bones are moved.
First go to the polygon and select the skin modifier, then click on envelope. And the paint weight tool is right below, the three dots represents settings for the paint weight tool, to either make it stronger or weaker.
Maximum strength of the tool is red color, and the weakest is blue. Also be careful during weight painting, if accidentally painted on other polygons, it will affect them as well.
Here's an example of how a painted weight model looks like:
Also an example of the model of after using the paint weight tool to adjust the polygons:
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