How to ignore the text check while typing in ngTagsInput?

I’m having a problem with the ng-tags-input directive, when i enter the first tag name D, it can be added success. With the second tag, i entered Đỏ but somethings cause the tag invalid, although i also set allow-leftover-text="true" in <tags-input><tags-input>. So does anyone has experiences about this issues?

Here is my input:

<tags-input ng-model="dataProducts.colors" placeholder="Nhập các màu" allow-leftover-text="true" replace-spaces-with-dashes="false"></tags-input>

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Source Url How to ignore the text check while typing in ngTagsInput?