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Hi @quangtuanhp123,
Welcome to TPG Community!
I've located your account using your Community details and was able to see that your current plan.
Provided that you're on our NBN12 with 11.0Mbps Basic Typical Evening Speed, the current speed that you are getting is within acceptable range.
You may consider changing to a higher speed tier plan. Click here for more information regarding our speed options.
You may also visit this link should you wish to know more on how to change your NBN plan - https://community.tpg.com.au/t5/Broadband-Internet/Changing-NBN-Plans-through-My-Account/td-p/6962
Let us know should you need further assistance.