well it's not really wrong but it's not probably what you want to say... kao rak mao means I love Chairman Mao.. if you say kao rak mao to me, i will reply kao kaw rak mao or I also love Chairman Mao)

so what you instead want to say is 𑜀𑜈𑜫 𑜍𑜀𑜫. 𑜉𑜧: - kao râk máu for i love you.. the following meme will make it clear. mau/maue/maur and mao are completely different words, keeping aside tones. and if you are still unable to understand just learn Ahom script properly