Legume or Bean family: These are all kinds of plants, vines, shrubs, and trees that produce a pod that splits on a single seam. The leaves of these plants are some of the best feeds for rabbits because they are high in protein. Examples are leaves of pigeon pea, peanut, beans, cowpea, velvet bean, Stylosanthes, soybean, Leucaena, tropical kudzu, Centrosema, jack bean, forage peanut, lablab bean, Gliricidia, Sesbania, Calliandra, and Albizia.
Grass family: Rabbits eat all kinds of grasses such as guinea grass, elephant or napier grass, signal grass, maize and millet leaves.
Trees: There are many non-leguminous tree leaves rabbits will eat such as banana, mango, moringa and nacedero.
Fruit: Rabbits love fruit. Feed them all the fruit that cannot be sold or eaten by humans such as overripe bananas (with the peel), mangoes, papaya, kenép (Spanish lime), avocados, pineapple and guava.
Weeds: Lots of weeds are good feed for rabbits such as crab grass, pig weed, goose grass and Spanish needle.
Leaves of cultivated plants: Sweet potato, maize, green beans, carrot tops, cabbage, and so on. Kitchen scraps: Feed your rabbits kitchen and table scraps such as potato peels, carrots, papaya rinds, water melon rinds, avocado skins and celery leaves.
Market waste: Rabbits thrive on market waste such as waste lettuce, cabbage, carrots, apples, and other fruits and vegetables.
Garden waste: Rabbits should be fed all waste left over after the harvest from home gardens of peanut hay, green bean leaves, corn husks, cowpea and bean hulls, and unusable fruits and vegetables.
Rabbits will also eat concentrated commercial (pelleted) feeds such as those made from corn, beans, wheat and millet
Here is a list of different things you could feed your bunnies when supplies of feed are limited...maybe you haven't considered some things on here. I'm not sure what area of indonesia you are in but there are plants that can be cultivated there and some wonderful edible foliage..it would definitely be helpful for you to get the free Picture This plant app if possible as others have mentioned...you may be surprised at the wealth of what is available for forage there.