I want to root my huawei phone but i've only found firmwares from another countries, would I have any problem if I flash my phone with any of these firmwares
If the firmware are made for your device you can flash it independently that it was made for a different country.
Take in mind that some countries have specific regulations regarding mobile devices, so some firmwares limit for example the wifi potence, the volume and/or the frequencies that the phone uses to work.
I think you need to break down the question: can you flash a custom rom that is used in another country? Yes you can.
The thing I'd be cautious about is flashing the part that is responsible for the communication itself. I think it's called "modem". Imagine there are are two countries and each operates on different transmission frequencies (900/1800/etc). If you flash incompatible version you may get into trouble making phone calls or connecting to the net at all.