Require to support multiple tags

[jacklandrin]

I have a html string here: <b><em><u>The sentence is a combination</u></em></b><b><em><u><sup>[1]</sup></u></em></b>

After setting bold, italic, underline and superscript style, the text doesn't display bold, but the rest styles work. How can I display bold and italic at the same time in my case?