# 1.9 Tùy chọn

{% content-ref url="1.9-tuy-chon/1.9.1-tuy-chon-chung" %}
[1.9.1-tuy-chon-chung](https://hotro-hoadonbachkhoa.pmbk.vn/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.1-tuy-chon-chung)
{% endcontent-ref %}

{% content-ref url="1.9-tuy-chon/1.9.2-dinh-dang-so" %}
[1.9.2-dinh-dang-so](https://hotro-hoadonbachkhoa.pmbk.vn/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.2-dinh-dang-so)
{% endcontent-ref %}

{% content-ref url="1.9-tuy-chon/1.9.3-thiet-lap-cong-cu-ky" %}
[1.9.3-thiet-lap-cong-cu-ky](https://hotro-hoadonbachkhoa.pmbk.vn/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.3-thiet-lap-cong-cu-ky)
{% endcontent-ref %}

{% content-ref url="1.9-tuy-chon/1.9.4-thiet-lap-email-gui-hoa-don" %}
[1.9.4-thiet-lap-email-gui-hoa-don](https://hotro-hoadonbachkhoa.pmbk.vn/cac-buoc-de-bat-dau-su-dung-phan-mem/1.9-tuy-chon/1.9.4-thiet-lap-email-gui-hoa-don)
{% endcontent-ref %}