How to effectively replace sentences in word document with python

This is what I made so far :

from docx import Documentdocument = Document('filename.docx')dic = {'Stack':'Stack Overflow','October 18 2021' : 'Actual Date'}for p in document.paragraphs:    inline = p.runs    for i in range(len(inline)):        text = inline[i].text        for key in dic.keys():            if key in text:                 text=text.replace(key,dic[key])                 inline[i].text = textdocument.save('new.docx')

But it seems that this function works fine when she need to replace one word, but whn she need to replace sentences, it doesn't work (here October 18 2021)/

Any ideas why sentences doesn't work ?