Disable Lucene similar term in results
var index = Sitecore.Context.Database.Indexes["intranet"];

        IndexSearcher searcher = index.GetSearcher(Sitecore.Context.Database);

        Analyzer analyzer = new StandardAnalyzer();


        var qp = new QueryParser(Sitecore.Data.Indexing.Index.ContentFieldName,
        analyzer);
        qp.SetAllowLeadingWildcard(true);
        qp.SetDefaultOperator(QueryParser.Operator.AND);

        Query query = qp.Parse(AddQueryOptions(_searchString));

        Hits hits = searcher.Search(query);

        return hits;