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Magento full text search not working

I do following steps

full text search option enable from system->configuration->catalogsearch

and

 app/code/core/Mage/CatalogSearch/Model/resources/Fulltext.php

change

 $likeCond = '(' . join(' OR ', $like) . ')';

to

 $likeCond = '(' . join(' AND', $like) . ')';

but still i not able to search fulltext word exactly match.

You also need to change

$where .= ($where ? ' OR ' : '') . $likeCond;

to

$where .= ($where ? ' AND ' : '') . $likeCond;