First, read the English article below.

Some orchids are easier to grow than others. Cattleya, Phalaenopsis and Paphiopedilum orchids are amongst the easiest to grow and are recommended for most beginner gardeners and orchid growers. There are, however, believed to be over 40,000 species of orchid species — that's two times the amount of existing bird species and four times the amount of existing mammalian species. There's almost literally an orchid for any type of person.  Perhaps the most common genera of orchids found for sale include Phalaenopsis, Dendrobium and Oncidium. Phalaenopsis is known as the "moth orchid" and is extremely popular among beginning growers; the genus Dendrobium contains about 1,200 species of orchids and is the classic epiphyte of orchids; Oncidiums are characterized by column wings and a callus at the lip of the flower. Different genera of orchids have different ideal humidities, growing temperatures, watering schedules, and light requirements. Talk with your local nursery or visit the local chapter of your orchid society to find out what makes your genus of orchid grow best. Some first-time orchid growers make the mistake of assuming that orchids need to be potted in soil like other blooming flowers, choosing potting soil as a conduit. That would likely kill your orchid. Most orchid roots need far more air than potting soil would give them, but they still need something to anchor their roots, and so they benefit from a looser, more porous mix. Many people use bark chips, sphagnum moss, coconut husks, charcoal, perlite, and even styrofoam pellets as potting mix, often in combination. Experiment with porous, breathable mixes that you have on hand, or ask an expert for his or her special recipe. For simplicity's sake, you can make two basic kinds of potting mixes that will work for most kinds of orchids. Make sure to add water to your mix and strain it before using for best results.   Make a fine potting mix, suitable for slipper orchids, most oncidiums, miltonias, and orchids with small roots that enjoy moisture more than... 

Now, please write a short abstract for it in Vietnamese. Abstract:
Chọn một loài lan. Chọn loại đất phù hợp với cây lan. Thử dùng hỗn hợp đất trồng cây trong chậu hoặc kết hợp nhiều loại giá thể. Chọn chậu nhỏ gọn nếu cây lan của bạn không to lắm. Trồng cây. Biết khi nào cần thay chậu cho lan.