Slice an orange in half to reveal the seeds. Use a spoon or knife to pick out the seeds. The tree that grows will likely produce similar fruit, so make sure you choose the seeds of an orange variety you like. Some orange varieties, such as navels and clementines, are seedless, and you won’t be able to propagate orange trees this way. Look for plump, whole, healthy seeds that don’t have any spots, marks, dents, breaks, discoloration, or other blemishes or imperfections. Transfer the seeds to a bowl and fill it with clean water. Use a clean tea cloth to wipe the seeds and remove all traces of flesh and juice.  Cleaning the seeds is also important for removing fungus and mold spores, and to prevent fruit flies.  You can clean and germinate all the seeds in the orange, and then pick the biggest and healthiest sprouts to plant. Fill a small bowl with clean room temperature water. Transfer the seeds to the water and let them soak for 24 hours. Many seeds have a better chance of sprouting if they're soaked first, because soaking softens the seed coating and kickstarts the germination.  When the seeds have soaked for 24 hours, drain the water and place the seeds on a clean towel. Don’t soak the seeds for longer than this, as they may become waterlogged and not sprout.

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Write a summary of the previous text in Vietnamese:
Lấy hạt cam ra khỏi quả. Chọn và rửa hạt cam. Ngâm hạt.