Nhân viên đang ở chi nhánh.

A natural breakdown is:

• nhân viên = employee / staff member
• đang = currently, in the middle of
• ở = to be at / to stay at / at
• chi nhánh = branch, branch office

So the structure is basically:

• Subject
  • đang
    • ở
      • place

That is a very common Vietnamese pattern.

Đang shows that something is happening right now or is currently true.

So:

• Nhân viên ở chi nhánh. = The employee is at the branch. / The employee is at the branch office.
• Nhân viên đang ở chi nhánh. = The employee is currently at the branch.

In many situations, Vietnamese can omit đang if the context already makes the time clear. Adding đang just makes the current, ongoing situation more explicit.

Vietnamese does not usually use articles like English does.

So nhân viên can mean:

• an employee
• the employee
• employees
• staff

The exact meaning depends on context.

Likewise, chi nhánh can mean:

• a branch
• the branch
• branch office

If you want to be more specific, Vietnamese usually adds other words instead of articles, for example:

• một nhân viên = an employee / one employee
• chi nhánh này = this branch
• chi nhánh đó = that branch

By itself, nhân viên is number-neutral. It does not automatically show singular or plural.

So depending on context, it could refer to:

• the employee
• an employee
• employees
• staff

If you want to make it clearly plural, you can say things like:

• các nhân viên = the employees
• những nhân viên = employees / the employees

If you want clearly singular, you can say:

• một nhân viên = one employee / an employee

Ở is commonly used to express location in Vietnamese. In this sentence, it means to be at or to be in a place.

So:

• ở chi nhánh = at the branch / in the branch office

It is a very common word for location:

• Tôi ở nhà. = I am at home.
• Cô ấy ở văn phòng. = She is at the office.

In this sentence, đang ở works like is currently at.

Chi nhánh usually means branch or branch office, especially for a company, bank, store chain, or organization.

Examples:

• chi nhánh ngân hàng = bank branch
• chi nhánh công ty = company branch

So in your sentence, chi nhánh most naturally means a business or organizational branch location.

It is actually fairly similar here.

Vietnamese:

• Nhân viên | đang ở | chi nhánh
• subject | verb phrase | place

English:

• The employee | is at | the branch

So the order is not especially difficult in this sentence. A learner mainly needs to notice that Vietnamese does not need:

• a form of to be like is
• articles like the
• tense endings on the verb

Instead, Vietnamese often uses separate words like đang to show aspect or time.

Yes, often you can.

• Nhân viên ở chi nhánh.
• Nhân viên đang ở chi nhánh.

Both are grammatical.

The version with đang emphasizes that the employee is currently there.
The version without đang is more neutral and may simply state the fact that the employee is at the branch.

In real conversation, Vietnamese often omits đang unless the speaker wants to stress the ongoing/current situation.

Not in this sentence.

Nhân viên is a common noun for a person’s role or job, and it can appear by itself.

You would add other words only if needed, for example:

• một nhân viên = one/an employee
• hai nhân viên = two employees
• các nhân viên = the employees

So Nhân viên đang ở chi nhánh is completely normal.

These words are related but not the same:

• nhân viên = employee, staff member
  
  • a general word for an employee
• công nhân = worker, usually manual or factory worker
• nhân sự = personnel, human resources, staffing

So nhân viên is the most natural word here if you mean an employee or staff member in general.

A rough guide:

• nhân viên: nhân has a level tone, viên also has a level tone
• đang: level tone
• ở: rising broken tone
• chi nhánh: chi level tone, nhánh has the acute/rising tone

A very rough English-friendly approximation is:

• nhun vyen dang uh chi nyanh

But this is only approximate. The tones and Vietnamese vowels matter a lot.

A few pronunciation notes:

• nh sounds somewhat like the ny in canyon
• chi sounds like chee
• nhánh begins with nh, not plain n
• ở has a distinctive Vietnamese vowel that does not match English exactly

You can add words for number, demonstratives, or time.

Examples:

• Một nhân viên đang ở chi nhánh. = An employee is at the branch.
• Các nhân viên đang ở chi nhánh. = The employees are at the branch.
• Nhân viên đang ở chi nhánh này. = The employee is at this branch.
• Nhân viên đang ở chi nhánh đó. = The employee is at that branch.
• Nhân viên đang ở trong chi nhánh. = The employee is inside the branch.

So the original sentence is natural but somewhat context-dependent, which is normal in Vietnamese.