How could people identify words by listening if they don't actually know it?

For example, someone just said "I would take you to flower house".
If the listener does not know "flower" and "house", Can he find that there are two words that he does not know? or He can just find that there are some syllables that he can’t decode, and he may treat “flowerhouse” as a single word.

Generally speaking, It is just some continuous syllables when we hear English. How could we know some syllables belong to one word, and some other syllables belong to another word, etc.?

When I use “how people know the separation of two words by sound” to google the question, It just give answer like “How to Count Phonemes in Spoken Words” which is about how to use syllable as block to build a word. But What I want to know is how could people could distinguish two unknown words.

Any advice or keywords for further searching is appreciated.
Thank you

———————-Edit at 2020/8/4————————-

Thank all you guys for replay. Can I summarize that:
1.There is no way to definitely separate each word just by listening
2.If people want the listener clearly know the construction of the sentence, they should reform the sentence in a more structured way, like “I would take you to ___ that XXX”

The reason that push me to ask this question is in some other language, such as Chinese, each character is constructed by One vowel and 1-3 consonants. So, you can know exactly how many characters you have just heard, even if you don’t know all words in the sentence. So, I want to know whether there is some parallel attribute in English.

@Edwin Ashworth
Why is ‘four candles / fork handles’ a conundrum?
“four candles” is pronounced as /fɔː kændəlz/
and “fork handles” is pronounced as /fɔːk hændəlz/.
So, there is one more syllable /h/ in “fork handles”.
Unless you don’t clearly pronounce /h/, It should be clear-cut between them.