Thợ sửa chữa sẽ sửa chữa máy giặt, thay bóng đèn.

Because the first sửa chữa and the second sửa chữa do different jobs in the sentence.

• thợ sửa chữa = repair worker / repairman / technician
  • Here sửa chữa helps describe what kind of worker this is.
• sẽ sửa chữa = will repair
  • Here sửa chữa is the main verb.

So the sentence is grammatical, but to an English speaker it may feel repetitive because English usually avoids repeating the same word so closely.

A more natural Vietnamese version might be:

• Thợ sửa chữa sẽ sửa máy giặt, thay bóng đèn.
• Người thợ sẽ sửa máy giặt và thay bóng đèn.

sẽ is a future marker. It usually means will.

So:

• sẽ sửa chữa = will repair
• sẽ thay = will replace

In Vietnamese, sẽ often appears before the verb, but it is not always required if the time is already clear from context.

For example:

• Ngày mai thợ sửa chữa máy giặt. = Tomorrow the technician repairs/will repair the washing machine.
• Ngày mai thợ sẽ sửa chữa máy giặt. = Tomorrow the technician will repair the washing machine.

Both can work, but sẽ makes the future meaning more explicit.

Vietnamese often joins actions without needing a separate word like and.

So this part:

• sửa chữa máy giặt, thay bóng đèn

means:

• repair the washing machine, and replace the light bulb

The second verb phrase thay bóng đèn still has the same subject, which is understood to be thợ sửa chữa.

You could also say:

• Thợ sửa chữa sẽ sửa chữa máy giặt và thay bóng đèn.

Using và is fine, but Vietnamese often omits it when listing actions.

It usually means replace the light bulb.

• thay = change / replace
• bóng đèn = light bulb / lamp bulb

In this context, thay bóng đèn most naturally means taking out the old bulb and putting in a new one.

thợ means a worker, craftsman, or tradesperson.

When combined with sửa chữa, it means someone whose job is repairing things:

• thợ sửa chữa = repairman / repair worker / technician

Depending on context, English translations could include:

• repairman
• technician
• mechanic
  (though mechanic may sound more specific in English)

Vietnamese often builds job titles this way:

• thợ điện = electrician
• thợ mộc = carpenter
• thợ sửa xe = vehicle repairman / mechanic

Yes, but they are very close.

• sửa = fix, repair, correct
• sửa chữa = repair, mend

In many situations, sửa is more common and more conversational. sửa chữa can sound a bit more formal or slightly more complete/emphatic.

So:

• sửa máy giặt = fix the washing machine
• sửa chữa máy giặt = repair the washing machine

Both are correct. In everyday speech, many people would simply say sửa máy giặt.

Because once sẽ has already marked the future for the sentence, it can apply to the following coordinated action too.

So:

• Thợ sửa chữa sẽ sửa chữa máy giặt, thay bóng đèn.

is understood as:

• The repairman will repair the washing machine and will replace the light bulb.

Vietnamese often avoids repeating markers like sẽ when the meaning is already clear.

You could repeat it, but it usually sounds unnecessary:

• Thợ sửa chữa sẽ sửa chữa máy giặt, sẽ thay bóng đèn.

This is grammatical, but less natural unless you want special emphasis.

Yes, mostly.

The structure is:

• Thợ sửa chữa = subject
• sẽ = future marker
• sửa chữa máy giặt = verb + object
• thay bóng đèn = second verb + object

So the basic pattern is:

• Subject + future marker + verb + object + second verb + object

This is fairly close to English:

• The repairman will repair the washing machine and replace the light bulb.

One difference is that Vietnamese does not need infinitive markers like to, articles like the/a, or always an explicit and.

Vietnamese does not use articles in the same way English does.

So:

• máy giặt can mean a washing machine or the washing machine
• bóng đèn can mean a light bulb or the light bulb

The exact meaning depends on context.

If you want to be more specific, Vietnamese can add words such as:

• một cái máy giặt = a washing machine
• cái máy giặt đó = that washing machine
• một bóng đèn = a light bulb
• bóng đèn này = this light bulb

But in many sentences, bare nouns are perfectly normal.

The comma is not strictly necessary, but it helps separate the two actions.

These are all possible:

• Thợ sửa chữa sẽ sửa chữa máy giặt, thay bóng đèn.
• Thợ sửa chữa sẽ sửa chữa máy giặt và thay bóng đèn.
• Thợ sửa chữa sẽ sửa chữa máy giặt thay bóng đèn.
  This last one is harder to read and may sound unclear.

So the comma is useful because it shows that thay bóng đèn is another action, not part of the washing-machine phrase.

It is understandable and grammatical, but many native speakers would probably choose a slightly smoother version because sửa chữa appears twice in a row.

More natural alternatives include:

• Thợ sửa chữa sẽ sửa máy giặt và thay bóng đèn.
• Người thợ sẽ sửa máy giặt, thay bóng đèn.
• Thợ sẽ sửa máy giặt và thay bóng đèn.

So the original sentence is fine for learning grammar, but in natural speech people often simplify repeated wording.