Tôi không những ứng tuyển mà còn giới thiệu bản thân.

It means not only ... but also ....

So:

• không những ứng tuyển = not only applied
• mà còn giới thiệu bản thân = but also introduced myself

This is a very common Vietnamese structure for linking two actions, qualities, or facts.

A close English equivalent is:

• I not only applied, but also introduced myself.

You may also see similar forms such as:

• không chỉ ... mà còn ...
• chẳng những ... mà còn ...

These are very similar in meaning.

Vietnamese often does not mark tense directly on the verb.

The verbs here:

• ứng tuyển
• giới thiệu

do not change form the way English verbs do.

Time is usually understood from:

• context
• time words like hôm qua (yesterday), ngày mai (tomorrow)
• aspect markers like đã, đang, sẽ

So this sentence by itself could mean different things depending on context, such as:

• I not only applied but also introduced myself
• I am not only applying but also introducing myself
• I will not only apply but also introduce myself

If you want to make past time clearer, you could say:

• Tôi đã không những ứng tuyển mà còn giới thiệu bản thân.

Ứng tuyển means to apply for a position, especially a job, role, program, or opportunity.

It is more formal and specific than just apply in a general sense.

Examples:

• ứng tuyển vào công ty = apply to a company
• ứng tuyển vị trí này = apply for this position

In your sentence, ứng tuyển sounds like applying for a job or similar opportunity.

Literally, it means introduce oneself.

Breakdown:

• giới thiệu = introduce / present
• bản thân = oneself / oneself personally

So giới thiệu bản thân is the standard way to say:

• introduce myself
• give a self-introduction

It is very common in interviews, classrooms, meetings, and social situations.

Tôi is a neutral, polite way to say I.

It is often the safest choice for learners because it works in many situations, especially:

• formal speech
• speaking to strangers
• interviews
• writing

However, Vietnamese pronouns depend a lot on relationship, age, and social context. In real life, a speaker might use other words instead of tôi, such as:

• em
• mình
• anh
• chị

So tôi is correct and natural, but it is not the only possible word for I.

Normally, they are used together as a pair:

• không những ... mà còn ...

This pairing is the standard and clearest form.

In casual speech, people may sometimes shorten things, but for learners it is best to treat them as a set.

Think of it like a matching structure:

• first part: không những = not only
• second part: mà còn = but also

Because Vietnamese often does not repeat the subject when it is already clear.

So:

• Tôi không những ứng tuyển mà còn giới thiệu bản thân.

means:

• I not only applied but also introduced myself.

You could repeat the subject in some situations for emphasis, but it is usually unnecessary here.

The structure is smooth and natural because both actions belong to the same subject, tôi.

Yes, slightly.

Vietnamese follows a pattern like:

• Subject + not only + verb/action + but also + verb/action

So:

• Tôi = I
• không những = not only
• ứng tuyển = apply
• mà còn = but also
• giới thiệu bản thân = introduce myself

This is quite close to English, but Vietnamese does not need verb conjugation, and it often sounds more compact.

It can still be understandable, but in real-life usage, ứng tuyển often includes what you are applying for.

For example:

• Tôi không những ứng tuyển vào công ty đó mà còn giới thiệu bản thân.
• Tôi không những ứng tuyển vị trí này mà còn giới thiệu bản thân rất kỹ.

Without an object, the sentence is still grammatically possible if the context already makes it obvious what the speaker applied for.

Yes, but it depends on the situation.

It can mean:

• introducing yourself in an interview
• writing a short self-introduction
• presenting yourself to recruiters or a company

In a job-related context, this sounds natural enough, especially if the speaker means they did more than just submit an application.

For example, the idea may be:

• I didn’t just apply; I also actively introduced myself.

That gives the sentence a slightly proactive or impressive tone.

Yes. A very common alternative is:

• không chỉ ... mà còn ...

So you could also say:

• Tôi không chỉ ứng tuyển mà còn giới thiệu bản thân.

This means almost the same thing:

• I not only applied but also introduced myself.

Compared with không những, không chỉ may sound a bit more common in everyday speech for many speakers, but both are correct.

You can add emphasis in a few ways, depending on style.

For example:

• Tôi không những ứng tuyển mà còn tự giới thiệu bản thân rất rõ ràng.
• Tôi không chỉ ứng tuyển mà còn chủ động giới thiệu bản thân.

Useful words:

• tự = oneself / by oneself
• rất rõ ràng = very clearly
• chủ động = proactively

These versions make it clearer that the speaker went beyond the basic action of applying.