A Doulos VHDL training course is a good way to help you. Training Courses
They do a superb 3 day introduction to VHDL course, I think it's about $2000 rough guess.
Or... become a senior designer & get ur colleagues to code VHDL for you!
VHDL is a complex language that takes months to become proficient in. For you to have to learn it and complete an assignment in a few weeks sounds unreasonable. I admire your spirit though.
Your teachers not knowing VHDL either. Maybe you can teach them!
Your english is adequate for me. But I do have an advantage, because I teach english. People who only know english as their only language have a tendency to be intolerant towards people who cannot use perfect english. What is 'perfect english' anyway! I think it's taken too seriously. I beleive they do not behave intolerantly deliberately, but it is because they mis-understand what is written and that they make an error in judgment. Only someone who is writing as a stranger, using a foriegn language can appreciate what it is like at the other screen and keyboard in a non-english country.