Autocomplete with natural language

in my project the User must enter the title of your ad and need an algorithm that seeks to which the tree of correct products. Hardly the name is exactly the same and probably he will have correspondence in several different subgroups, we have to choose the closest. For so I have a basic categories, groups and subgroups and 250 titles of products for each subgroup to be used as training and consultation base. My project is in node (meteor, javascript).