Nh\u1eefng ng\u01b0\u1eddi ch\u01a1i l\u00f4 \u0111\u1ec1 \u0111\u1ec1u c\u00f3 nh\u1eefng c\u00e1ch ch\u01a1i kh\u00e1c nhau. Ng\u01b0\u1eddi th\u00ec ch\u01a1i theo gi\u1ea5c m\u01a1 c\u1ee7a m\u00ecnh, ng\u01b0\u1eddi th\u00ec ch\u01a1i theo c\u00e1c con s\u1ed1 ng\u1eabu nhi\u00ean g\u1eb7p h\u00e0ng ng\u00e0y, ng\u01b0\u1eddi th\u00ec th\u00edch s\u1ed1 n\u00e0o \u0111\u00e1nh s\u1ed1 \u0111\u00f3. Nh\u01b0ng ch\u00fang t\u00f4i khuy\u00ean t\u1ea5t c\u1ea3 c\u00e1c b\u1ea1n n\u00ean nghi\u00ean c\u1ee9u ch\u01a1i l\u00f4 \u0111\u1ec1 m\u1ed9t c\u00e1ch b\u00e0i b\u1ea3n, khoa h\u1ecdc.<\/p>\n
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