Trong c\u00e1c h\u00ecnh th\u1ee9c ch\u01a1i l\u00f4 \u0111\u1ec1 th\u00ec l\u00f4 xi\u00ean l\u00e0 h\u00ecnh th\u1ee9c \u0111\u01b0\u1ee3c nhi\u1ec1u c\u00e1c anh em \u0111am m\u00ea soi c\u1ea7u l\u1ea5y s\u1ed1 l\u1ef1a ch\u1ecdn. \u0110\u00e2y l\u00e0 ki\u1ec3u ch\u01a1i l\u00f4 \u0111\u01b0\u1ee3c nhi\u1ec1u ng\u01b0\u1eddi s\u1eed d\u1ee5ng. V\u00e0 c\u00f9ng \u0111\u00e1nh nhi\u1ec1u s\u1ed1 1 l\u00fac \u0111\u1ec3 mang l\u1ea1i k\u1ebft qu\u1ea3 t\u1ed1t nh\u1ea5t. B\u00ean c\u1ea1nh \u0111\u00f3, \u0111\u00e1nh l\u00f4 xi\u00ean c\u00f3 nhi\u1ec1u lo\u1ea1i nh\u01b0 xi\u00ean \u0111\u00f4i, xi\u00ean 3 hay xi\u00ean 4. Vi\u1ec7c \u0111\u00e1nh xi\u00ean 4 s\u1ebd gi\u00fap c\u00e1c b\u1ea1n c\u00f3 t\u1ef7 l\u1ec7 th\u1eafng gi\u1ea3i cao h\u01a1n v\u00e0 thu \u0111\u01b0\u1ee3c kho\u1ea3n l\u1ee3i nhu\u1eadn l\u1edbn h\u01a1n.<\/p>\n
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