python docx---I want to search and highlight 2 words in the same line

[supert1123]

i want to search 2 and more word the same in line and highlight it. but it skip the first word. Some can help me fix it. this is my source:

from email.mime import base
from docx import Document
from docx2pdf import convert
from subprocess import Popen
from PyPDF2 import PdfFileReader as read
from pdf2image import convert_from_path
import numpy as np
import base64
import cv2
import os
import docx
from docx.shared import Pt
from docx.enum.style import WD_STYLE_TYPE
import subprocess
import re
from docx.enum.text import WD_COLOR_INDEX
from docx.document import Document as _Document
from docx.oxml.text.paragraph import CT_P
from docx.oxml.table import CT_Tbl
from docx.table import _Cell, Table
from docx.text.paragraph import Paragraph
import re
import docx
from docx.shared import Pt
from docx.enum.style import WD_STYLE_TYPE
def findColor(filename,key,newName):
    doc = Document(filename)
    par = doc.paragraphs[0]
    font_styles = doc.styles
    font_charstyle = font_styles.add_style('CommentsStyle', WD_STYLE_TYPE.CHARACTER)
    font_object = font_charstyle.font
    if par.runs[0].font.name != None:
        font_object.name = f'{par.runs[0].font.name}'
    sizes = Size(filename)
    run = 0
    for p in doc.paragraphs:
        for i in p.runs:
            if i.font.size != None:
                font_object.size = Pt(sizes[run])
                run += 1
    for block in iter_block_items(doc):
        if isinstance(block, Paragraph):
            p1 = block.text
            match = re.findall(key,p1,re.IGNORECASE)
            if match:
                block.text = ""
                countKey=color_string(match,countKey,p1,block)
        else:
            for row in block.rows:
                for p in row.cells:
                    p1 = p.text
                    match = re.findall(key,p1,re.IGNORECASE)
                    if match: #so khớp không phân biệt hoa thường
                        p = p.add_paragraph()
                        countKey=color_string(match,countKey,p1,p)
    doc.save(newName)
    return countKey
def color_string(key,countKey,p1,p):
    substrings = p1.split(key)
    for substring in substrings[:-1]:
        countKey += 1
        b = p.add_run(substring,style = 'CommentsStyle') 
        font = p.add_run(key,style = 'CommentsStyle').font.highlight_color = WD_COLOR_INDEX.YELLOW 
        count = str(countKey)
        font = p.add_run(count,style = 'CommentsStyle').font.highlight_color = WD_COLOR_INDEX.RED 
    p.add_run(substrings[-1], style = 'CommentsStyle')
    return countKey
run :  findColor('filename(.docx)','key','newName(.docx)')