First of all, you can learn from your girlfriend what her parents like, and then give them something they like during the Chinese New Year. Such gifts are more practical and thoughtful, and her parents will be very happy after receiving them.
Of course, you can also give some local specialties to your girlfriend's parents. Generally, specialties are not very expensive to buy locally. This can express your thoughts and save money. It is a good gift recommendation! Some festive New Year goods are also OK, and the special ones are of course better!
However, one thing to note is that you need to understand whether her parents like to save face or like to be frugal. If your girlfriend's parents are very frugal, and you give some expensive and impractical gifts, they will be very disgusted.
Finally, please note that if this is your first time to give gifts to your girlfriend's parents, then give some ordinary gifts, as long as you can express your thoughts, so that it will not seem very artificial. After all, if the first gift is too expensive, it will be difficult for people to accept it.