Translation:This woman does not recognize these girls.
I don't understand the word order, how do you know who is recognizing? In this sentence: "tato žena nepoznává tahle děvčata" I understand it is "this woman does not ....." and in this one : "Tato děvčata tato slova neposnávají" it is also "these girls are not recognizing ..." But in the given sentence it is "this woman...." and not "these girls....", I am lost pls can somebody explain?
The word order in Czech does not differentiate the subject from the object. That happens in English and that is why the English word order is rigid.
Czech word order is free. Czech uses grammatical cases to differentiate the subject from the object. Here "žena" is nominative, so it is the subject because "poznávat" requires the object in accusative. Accusative of "žena" would be "ženu".
Another grammatical tool to differentiate the subject is the agreement of the verb and the subject. "Nepoznává" is singular so the subject cannot be "děvčata" because they are in plural.
If you switch the onbject and the subject you get:
Tato děvčata tuto ženu nepoznávají."
I hope it is clear why.
Some Czech sentences are impossible to parse without context when the nominative is identical to the accusative in both nouns.
Děti poznávají devčata.
It can have both meanings although the SVO order is probably the default. The context decides.
If I may add, "Tato děvčata tuto ženu nepoznávají" ="Tuto ženu tato děvčata nepoznávají". It doesn't make any difference. Wordorder changes, but meaning is already grammatically determined. (Cf. "Tato děvčata tato žena nepoznává" grammar changes, so does the meaning).