Nh\u1eefng \u0111\u1ed1i t\u01b0\u1ee3ng n\u00e0o \u0111\u01b0\u1ee3c h\u01b0\u1edfng \u01b0u ti\u00ean trong x\u00e9t tuy\u1ec3n \u0111\u1ea1i h\u1ecdc?<\/a><\/blockquote><\/iframe>