Tôi thấy bụi và rác trên sàn nhà.

The sentence follows a very common Vietnamese pattern:

Tôi + thấy + bụi và rác + trên sàn nhà
subject + verb + object + location

So literally, it is:

• Tôi = I
• thấy = see
• bụi và rác = dust and trash
• trên sàn nhà = on the floor

Vietnamese word order here is quite similar to English.

Thấy usually means to see, to notice, or to perceive.

In this sentence, Tôi thấy bụi và rác... means you visually notice dust and trash. Depending on context, it can feel like:

• I see dust and trash on the floor
• I notice dust and trash on the floor

So thấy is not always just the physical act of seeing. It can also mean becoming aware of something.

Vietnamese normally does not use articles like a, an, or the the way English does.

So:

• bụi can mean dust
• rác can mean trash, garbage, or litter
• sàn nhà can mean the floor or just floor, depending on context

Vietnamese relies heavily on context. If the meaning is clear, no article is needed.

Bụi means dust. Like dust in English, it is usually treated as an uncountable substance.

So you do not normally count individual bits of bụi. You just refer to it as a mass:

• có bụi = there is dust
• nhiều bụi = a lot of dust

It can also appear in other meanings in different contexts, but in this sentence it simply means dust.

Rác means trash, garbage, or litter.

The difference is:

• bụi = dust, fine dirt, powder-like dirt
• rác = pieces of waste or discarded things

So bụi và rác means there is both fine dirt and larger waste on the floor.

Và means and.

So:

• bụi và rác = dust and trash

This works very much like English. Vietnamese also sometimes links nouns without và in certain contexts, but using và here is straightforward and natural.

Trên means on, above, or over, depending on context.

In this sentence:

• trên sàn nhà = on the floor

It shows location. The dust and trash are located on top of the floor surface.

Sàn nhà literally means something like house floor or the floor of the house/room.

Breakdown:

• sàn = floor surface
• nhà = house, home

Together, sàn nhà means floor in the sense of the indoor floor.

This combination is very natural in Vietnamese. Depending on region and context, you may also hear nền nhà, but sàn nhà is perfectly understandable and common.

Vietnamese often puts location phrases after the verb and object.

So:

• Tôi thấy bụi và rác trên sàn nhà

is a normal structure: I see dust and trash on the floor.

You are first told what was seen, then where it was seen.

Sometimes yes, but it depends on context.

Vietnamese often drops subjects when they are already obvious. So in conversation, someone might simply say:

• Thấy bụi và rác trên sàn nhà.

if it is already clear who is speaking.

But in a full standalone sentence, Tôi is included for clarity and sounds natural.

Vietnamese verbs do not change form for tense the way English verbs do.

Thấy stays thấy whether the meaning is present, past, or sometimes even future, depending on context.

So Tôi thấy bụi và rác trên sàn nhà often means:

• I see dust and trash on the floor
• I noticed dust and trash on the floor

If you want to be more specific, Vietnamese can add time words or markers like:

• đã = past/completed
• đang = ongoing
• sẽ = future

For example:

• Tôi đã thấy bụi và rác trên sàn nhà. = I saw / noticed dust and trash on the floor.

A rough English-friendly pronunciation is:

Tôi thấy bụi và rác trên sàn nhà
≈ toy thay boo-ee va rack chern sahn nya

That is only approximate. A few important points:

• tôi has a diphthong and a level tone
• thấy has the sắc tone, so it rises
• bụi has a heavy, low broken tone
• rác also has a rising tone
• trên starts with tr, which is not exactly English ch, though learners often approximate it that way
• nh in nhà sounds like the ny in canyon

Because Vietnamese is tonal, correct tones matter a lot for being understood.

Yes, it is natural and clear.

A native speaker might also say similar versions depending on context, such as:

• Tôi thấy có bụi và rác trên sàn nhà.
  = I see that there is dust and trash on the floor.

• Trên sàn nhà có bụi và rác.
  = There is dust and trash on the floor.

• Sàn nhà có bụi và rác.
  = The floor has dust and trash / There is dust and trash on the floor.

Your original sentence is perfectly normal, especially if the focus is on what I see.