Hotelrechnung und Kostennachweis fehlen noch.

Because the subject is actually two things joined by und:

• Hotelrechnung = hotel bill
• Kostennachweis = proof/itemization of costs

So German treats them together as a plural subject, which is why the verb is fehlen rather than fehlt.

Compare:

• Die Hotelrechnung fehlt noch. = The hotel bill is still missing.
• Hotelrechnung und Kostennachweis fehlen noch. = The hotel bill and proof of costs are still missing.

German often leaves out articles in certain formal, bureaucratic, or list-like contexts. This sentence sounds a bit like office or administrative language, where documents are being named in a concise way.

So:

• Hotelrechnung und Kostennachweis fehlen noch.

sounds like a checklist or status update: Hotel bill and proof of costs are still missing.

You could also say:

• Die Hotelrechnung und der Kostennachweis fehlen noch.

That is also grammatically correct, but it may sound a little less clipped and formal. The article-less version is very common in business or paperwork contexts.

Here noch means still.

So the sentence means that these documents have not been provided yet, but are expected.

• fehlen noch = are still missing

Compare:

• Die Unterlagen fehlen. = The documents are missing.
• Die Unterlagen fehlen noch. = The documents are still missing.

That noch adds the idea of up to now / not yet submitted.

Not exactly. German fehlen usually means to be missing or to be absent/lacking, not to feel the absence of something.

In this sentence:

• Hotelrechnung und Kostennachweis fehlen noch.
• Literally: Hotel bill and proof of costs are still missing.

This is different from English I miss you.

For that emotional meaning, German uses:

• Ich vermisse dich. = I miss you.

So:

• X fehlt = X is missing
• Ich vermisse X = I miss X

They are in the nominative case because they are the subject of the sentence.

You can tell because they are the things doing the verb in a grammatical sense:

• Hotelrechnung und Kostennachweis fehlen noch.

Even though in English we may think of them as objects that are missing, in German they are grammatically the subject: the things that are missing.

Both are possible.

• Hotelrechnung und Kostennachweis fehlen noch.
• Es fehlen noch Hotelrechnung und Kostennachweis.

The first version is more direct and topic-first: it starts with the documents themselves.

The second version with es can sound a little more like There are still missing... or The following are still missing...

German is flexible about word order, but the conjugated verb still has to stay in second position in a normal statement.

Yes, it is a normal formal/administrative word.

It is a compound noun:

• Kosten = costs / expenses
• Nachweis = proof / evidence / record

So Kostennachweis literally means something like proof of costs or documentation of expenses.

German uses compound nouns very often, especially in formal contexts. English often expresses the same idea with a phrase rather than one word.

Because all nouns are capitalized in German.

So:

• Hotelrechnung
• Kostennachweis

are capitalized because they are nouns.

This is one of the most noticeable differences from English. In German, common nouns are always written with an initial capital letter.

Normally, no. Without further context, Hotelrechnung and Kostennachweis are understood as singular nouns.

The plural forms would be different:

• Hotelrechnungen = hotel bills
• Kostennachweise = proofs/records of costs

So this sentence most naturally means:

• The hotel bill and the proof of costs are still missing.

In standard German, once you have two coordinated nouns with und, the verb should normally be plural:

• Es fehlen noch die Hotelrechnung und der Kostennachweis.

Using singular fehlt with two separate items would usually sound wrong to learners and to most native speakers in this structure.

Singular would only work if the whole subject were understood as one unit in some special context, but that is not the normal reading here.

It sounds formal, concise, and administrative.

You might see or hear it in contexts like:

• expense reports
• reimbursement requests
• travel accounting
• office communication
• checklists of missing documents

It does not sound especially conversational or emotional. A more everyday spoken version might be something like:

• Die Hotelrechnung und der Kostennachweis fehlen noch.

That feels a little more natural in ordinary speech because of the articles.

Yes, very often it does.

When someone says:

• Hotelrechnung und Kostennachweis fehlen noch.

the implication is usually:

• they have not been submitted yet
• they are required
• they are expected to be added later

So noch does not just describe absence; it often suggests not yet, but presumably soon or eventually.

Then the verb would be singular:

• Die Hotelrechnung fehlt noch.
• Der Kostennachweis fehlt noch.

So the pattern is:

• singular subject → fehlt
• plural/coordinated subject → fehlen

That is the key grammar point in the original sentence.