Problemas al buscar 2 o más palabras clave (search engine, fulltext, mysql, php)

[sidney rees]

Esta es mi base de datos:

CREATE TABLE `tienda` (
`id` int(11) NOT NULL auto_increment,
`title` varchar(255) collate utf8_unicode_ci NOT NULL,
`description` text collate utf8_unicode_ci NOT NULL,
`keywords` text collate utf8_unicode_ci NOT NULL,
`category` varchar(255) collate utf8_unicode_ci NOT NULL,
`state` varchar(5) collate utf8_unicode_ci NOT NULL,
PRIMARY KEY (`id`),
FULLTEXT KEY `busqueda` (`description`,`keywords`,`category`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=3 ;