Sai kích cỡ? Yêu cầu hoàn tiền.

Vietnamese often omits the subject when it is obvious from context.

In a shopping or customer-service context, Sai kích cỡ? is a very compressed way to mean something like:

• Bị sai kích cỡ à?
• Sản phẩm bị sai kích cỡ à?
• Nếu sai kích cỡ...

In English, we usually need more structure, but Vietnamese often allows short fragments like this in ads, buttons, notices, and support messages.

Sai means wrong, incorrect, or mistaken.

In Sai kích cỡ, it means the size is wrong or does not match what it should be.

Common examples:

• sai địa chỉ = wrong address
• sai tên = wrong name
• sai màu = wrong color
• sai kích cỡ = wrong size

So here sai is describing a mismatch, not just a random mistake.

In Vietnamese, modifiers do not always work the same way as in English.

Sai kích cỡ is a fixed, natural way to say wrong size or incorrect sizing. Here, sai comes first and applies to the following noun phrase.

By contrast, kích cỡ sai sounds incomplete or unnatural in most everyday situations.

Natural options include:

• sai kích cỡ
• không đúng kích cỡ
• không đúng cỡ

Among these, sai kích cỡ is short and very suitable for labels or customer-service text.

Kích cỡ means size.
Cỡ can also mean size, and in many contexts the two are very close.

However:

• kích cỡ sounds a little more formal or complete
• cỡ is shorter and very common in everyday speech

For clothing, people often say:

• sai cỡ
• không đúng size
• không đúng kích cỡ

In modern usage, especially in shopping, you may also hear size directly as a loanword.

Not really in the strict grammatical sense. It is more like an elliptical question or headline-style prompt.

It functions like:

• Wrong size?
• Received the wrong size?

Vietnamese often uses these shortened forms in:

• advertisements
• app interfaces
• return policies
• customer support pages

So the question mark is natural because the sentence is prompting the reader based on a possible problem.

It is another shortened expression.

• yêu cầu = to request / request
• hoàn tiền = refund / return money

Together, Yêu cầu hoàn tiền means request a refund.

This can be understood as an instruction:

• Hãy yêu cầu hoàn tiền. = Request a refund.

Or as a menu/button label:

• Yêu cầu hoàn tiền = Refund request / Request refund

Vietnamese often leaves out words like hãy when giving short instructions.

It can be understood either way, depending on context.

1. As a verb:

   • Yêu cầu hoàn tiền = Request a refund

2. As a noun phrase / label:

   • Yêu cầu hoàn tiền = Refund request

In short customer-service text, Vietnamese often leaves this ambiguous on purpose because both readings are useful and natural.

Because Vietnamese often drops hãy in short commands, especially in practical or written contexts.

Compare:

• Hãy yêu cầu hoàn tiền. = full imperative, a bit more explicit
• Yêu cầu hoàn tiền. = shorter, more direct, common in UI/support text

This is similar to English button text like:

• Request refund
• Contact support
• Track order

These are not full sentences either, but they are perfectly normal in context.

Yes, that is the literal sense:

• hoàn = return, give back
• tiền = money

So hoàn tiền literally means return money, but the natural English equivalent is usually refund.

That is why:

• yêu cầu hoàn tiền = request a refund
• được hoàn tiền = be refunded
• chính sách hoàn tiền = refund policy

It is natural, but it is especially natural in customer-service, e-commerce, and interface language.

A full conversational version might be:

• Nếu sản phẩm sai kích cỡ, bạn có thể yêu cầu hoàn tiền.
• Nếu hàng bị sai kích cỡ, hãy yêu cầu hoàn tiền.

The original version is much shorter because it is meant to be quick and easy to read, like a help prompt or website notice.

Yes. In real life, especially in shopping and fashion contexts, many speakers use size as a loanword.

So all of these can occur:

• Sai kích cỡ
• Sai cỡ
• Sai size

The most natural choice depends on tone and context:

• kích cỡ = a bit more standard/written
• cỡ = everyday Vietnamese
• size = very common in fashion and online shopping

A fuller version could be:

• Nếu bị sai kích cỡ, hãy yêu cầu hoàn tiền.
• Nếu sản phẩm sai kích cỡ, bạn có thể yêu cầu hoàn tiền.

These versions make the grammar clearer because they include words that are omitted in the short original:

• nếu = if
• bị = be affected by
• hãy = do..., please / imperative marker
• bạn có thể = you can

So the original is best understood as a condensed version of a longer sentence like these.