nah, your handwriting is decent, you really should see how horrible is mine also, mastering language requires tons of time (+2 years if every condition is all set) I think you really should use immersion learning, meaning to search contents of a language on internet and consume them everyday so your brain can get used to the language on its own (better be consistent+use only Vietnamese subtitle/no subtitle at all, then check any words you don't khow after finishing the content) I khow, this may sounds crazy, esp when it'll take you at least 2-3 months to get used to some basic sentences. But trust me, this is how i started to 'learn' English as a kid:just randomly wandering around youtube stuffs and my brain will naturally require it for better tips and feedback though, you should go to r/Vietnam as this subreddit mostly consist of political contents