Thanks guys i went today they just extend me 7 days after my visa expire date reason i cant get 30days i came with transit visa so if u have that kind of visa its 7days extension if tourist visa 30days extension
Before i use to aply in hongkong and china last time i was here April in vietnam I applied from consulate they ask me bank statement hotel booking and my flight booking was fine but today they told me laws change this September I tried to ask hongkong my friends said same now they need resident card /permit that's why im looking another option because it will cost me too much to go back home just for one month visa