When giving gifts to elders who treat you well, it is best to give them something practical, something that can express your feelings. My suggestion to you is to buy a new set of clothes for your uncle and aunt, and the clothes should be of good quality, so that when they go out wearing them, the neighbors in the village will be proud to say that you bought them.
You can also give some small appliances that are helpful for life, because uncles and aunts live in the countryside, and it may not be convenient for them to buy appliances. You can buy them a good one, such as a soybean milk machine, a washing machine, an air conditioner, etc. Such a gift can improve their living standards and is also a good way to give gifts.
Of course, if your uncle is willing to drink a few glasses of wine, you can also give him wine. If he doesn't drink, you can also give him tea, or a set of high-end tea sets, so that your uncle and aunt can also have face when entertaining friends in the countryside. Such a gift is also good, and you can also consider it.
Finally, don’t forget to bring them some local specialties. There must be some local specialties where you work. Buy them some that your uncles and aunts have never seen or heard of. They will surely like such gifts and will know that you are a thoughtful child and that your love for you is not in vain.