代码：

string keyword =RemoveHTML(GetString("Keyword"));

        StringBuilder strWhere=new StringBuilder("isaudit=1 "+(typeId==0?"": "and TypeID=" + typeId));
        if (!string.IsNullOrWhiteSpace(keyword))
        {
            if (keyword.Length > 2)
            {   /*中文分词功能*/
                JiebaSegmenter jieba = new JiebaSegmenter();
                var segments = jieba.CutForSearch(keyword);
                strWhere.Append(" and (");
                foreach (string key in segments)
                {
                    strWhere.AppendFormat(" title like '%{0}%' or", key);
                }
                strWhere.Append(")");
                keyword = string.Join(",", segments);
            }
            else 
                {
                  strWhere.AppendFormat(" and  title like '%{0}%' or",keyword);
                }
        }

相关文档：https://www.cnblogs.com/anderslly/p/jiebanet.html